| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| December | 10 | 1941 | I 170 | Submarine | 1,785 | 23-45N, 155-35W | United States | Navy Carrier- Based Aircraft | Sunk |
| 10 | MINESWEEPER NO 10 | Minesweeper | 630 | 17-32N, 120-22E | United States | Army Aircraft | Sunk | ||
| 10 | MINESWEEPER NO 19 | Minesweeper | 492 | 18-22N, 121-38E | United States | Army Aircraft | Sunk | ||
| 11 | HATATE | Destroyer | 1,270 | 19-16N, 166-37E | United States | Navy Shore-Battery | Sunk | ||
| 11 | KISARAGI | Destroyer | 1,500 | 19-16N, 166-37E | United States | Navy Shore-Battery | Sunk | ||
| 17 | RO 66 | Submarine | 988 | 19-25N, 166-30E | Japan | Marine Casualty | Sunk | ||
| 18 | SHINONOME | Destroyer | 1,950 | 4-24N, 114-00E | Netherlands | Mine | Sunk | ||
| 22 | PATROL BOAT NO 32 | Old Destroyer | 750e | 19-17N, 166-35E | Japan | Marine Casualty | Sunk | ||
| 22 | PATROL BOAT NO 33 | Old Destroyer | 750e | 19-17N, 166-35E | Japan | Marine Casualty | Sunk | ||
| 24 | SAGIRI | Destroyer | 1,950 | 1-34N, 110-21E | Netherlands | Submarine | Sunk | ||
| 26 | MINESWEEPER NO 6 | Minesweeper | 615 | 1-34N, 110-21E | Netherlands | Army Aircraft | Sunk | ||
| 29 | RO 60 | Submarine | 988 | 9-00N, 167-40E | Japan | Marine Casualty | Sunk | ||
| 12 Vessels | 13,668 | ||||||||
| January | 12 | 1942 | MINESWEEPER NO 13 | Minesweeper | 492 | 3-15N, 113-35E | Netherlands | Shore Battery | Sunk |
| 12 | MINESWEEPER NO 14 | Minesweeper | 492 | 3-15N, 113-35E | Netherlands | Shore Battery | Sunk | ||
| 17 | I 160 | Submarine | 1,635 | 6-00S, 105-00E | Great Britain | Surface Craft | Sunk | ||
| 20 | I 124 | Submarine | 1,142 | 12-05S, 130-06E | United States Great Britain |
Surface Craft Surface Craft |
Sunk | ||
| 24 | PATROL BOAT NO 37 | Old Destroyer | 750e | 00-10N, 118-00E | United States | Surface Craft | Sunk | ||
| 27 | I 173 | Submarine | 1,785 | 28-24N, 178-35E | United States | Submarine | Sunk | ||
| 29 | I 23 | Submarine | 2,212 | 20-35N, 155-29W | United States | Surface Craft | Sunk | ||
| 7 Vessels | 8,508 | ||||||||
| February | 2 | 1942 | MINESWEEPER NO 9 | Minesweeper | 630 | 3-42S, 128-10E | Netherlands | Mine | Sunk |
| 8 | NATSUSHIO | Destroyer | 1,900. | 5-10S, 119-24E | United States | Submarine | Sunk | ||
| 2 Vessels | 2,530 | ||||||||
| April | 3 | 1942 | UNKNOWN | Frigate | 750e | 00-36N, 119-19E | United States | Submarine | Probably sunk |
| 26 | RO 30 | Submarine | 965 | 18-11N, 166-54W | United States | Submarine | Sunk | ||
| 2 Vessels | 1,715 | ||||||||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| May | 2 | 1942 | MIZUHO | Seaplane Tender | 9,000 | 34-26N, 138-14E | United States | Submarine | Sunk |
| 4 | KIKUTSUKI | Destroyer | 1,500 | 9-07S, 160-12E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 7 | SHOHO | Light Aircraft Carrier | 12,000 | 10-29S, 152-55E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 11 | OKINOSHIMA | Minelayer | 4,400 | 5-06S, 153-48E | United States | Submarine | Sunk | ||
| 17 | I 28 | Submarine | 2,212 | 6-30N, 152-00E | United States | Submarine | Sunk | ||
| 17 | I 164 | Submarine | 1,625 | 29-25N, 134-09E | United States | Submarine | Sunk | ||
| 25 | ASAHI | Repair Ship | 11,441 | 10-00N, 110-00E | United States | Submarine | Sunk | ||
| 7 Vessels | 42,178 | ||||||||
| June | 1 | 1942 | RO 35 | Submarine | 965 | Pacific Area | Japan | Marine Casualty | Sunk |
| 4 | AKAGI | Aircraft Carrier | 36,000 | 30-00N, 179-00W | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 4 | KAGA | Aircraft Carrier | 35,000 | 30-00N, 179-00W | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 4 | HIRYU | Light Aircraft Carrier | 17,500 | 31-15N, 179-05E | United States | Navy Carrier- Based Aircraft |
Sank | ||
| 4 | SORYU | Light Aircraft Carrier | 17,500 | 30-13N, 179-17W | United States | Navy Carrier- Based Aircraft Submarine |
Sunk | ||
| 6 | MIKUMA | Heavy Cruiser | 13,000 | 30-00N, 173-00E | United States | Navy Carrier- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 25 | YAMAKAZE | Destroyer | 1,580 | 34-34N, 140-26E | United States | Submarine | Sunk | ||
| 7 Vessels | 121,545 | ||||||||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| July | 4 | 1942 | NENOHI | Destroyer | 1,600 | 52-15N, 173-51E | United States | Submarine | Sunk |
| 5 | ARARE | Destroyer | 1,850 | 52-00N, 177-40E | United States | Submarine | Sunk | ||
| 9 | RO 32 | Submarine | 700 | 55-20N, 134-40W | United States Great Britain | Surface Craft Aircraft | Sunk | ||
| 15 | SUBMARINE CHASER NO 25 | Submarine Chaser | 300 | 52-02N, 177-42E | United States | Submarine | Sunk | ||
| 15 | SUBMARINE CHASER NO 27 | Submarine Chaser | 300 | 52-02N, 177-42E | United States | Submarine | Sunk | ||
| 5 Vessels | 4,750 | ||||||||
| August | 10 | 1942 | KAKO | Heavy Cruiser | 8,800 | 2-15S, 152-15E | United States | Submarine | Sunk |
| 24 | RYUJO | Light Aircraft Carrier | 8,500e | 6-20S, 160-50E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 25 | MUTSUKI | Destroyer | 1,500 | 7-47S, 160-13E | United States | Army Aircraft | Sunk | ||
| 28 | I 123 | Submarine | 1,142 | 9-21S, 160-43E | United States | Surface Craft | Sunk | ||
| 28 | ASAGIRI | Destroyer | 1,950 | 8-00S, 160-10E | United States | Marine Land- Based Aircraft |
Probably sunk | ||
| 29 | RO 33 | Submarine | 700 | 9-36S, 147-06E | Great Britain | Surface Craft | Sunk | ||
| 31 | RO 61 | Submarine | 983 | 52-36N, 173-57N | United States | Navy Land- Based Aircraft Surface Craft |
Sunk | ||
| 7 Vessels | 23,580 | ||||||||
| September | - | 1942 | RO 65 | Submarine | 988 | North Pacific | Unknown | Unknown | Sunk |
| 11 | YAYOI | Destroyer | 1,500 | 8-45S, 151-25E | United States Great Britain |
Army Aircraft Aircraft |
Sunk | ||
| 2 Vessels | 2,488 | ||||||||
| October | - | 1942 | I 30 | Submarine | 2,212 | l-00N, 105-00E | Great Britain | Mine | Sunk |
| 11 | FURUTAKA | Heavy Cruiser | 8,800 | 9-00S, 159-50E | United States | Surface Craft | Sunk | ||
| 11 | FUBUKI | Destroyer | 1,950 | 9-10S, 159-40E | United States | Surface Craft | Sunk | ||
| 11 | NATSUGUMO | Destroyer | 1,850 | 9-10S, 159-40E | United States | Surface Craft | Sunk | ||
| 12 | MURAKUMO | Destroyer | 1,950 | 8-40S, 158-20E | United States | Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 16 | OBORO | Destroyer | 1,950 | 52-17N, 178-08E | United States | Army Aircraft | Sunk | ||
| 25 | YURA | Light Cruiser | 5,700 | 8-40S, 160-00E | United States | Army Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 7 Vessels | 24,412 | ||||||||
| November | 10 | 1942 | I 172 | Submarine | 1,785 | 10-13S, 161-09E | United States | Surface Craft | Sunk |
| 13 | AKATSUKI | Destroyer | 1,950 | 9-10S, 159-45E | United States | Surface Craft | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| November | 13 | 1942 | YUDACHI | Destroyer | 1,580 | 9-10S, 149-458 | United States | Surface Craft | Sunk |
| 13 | HIYEI | Battleship | 31,000 | 9-00S, 159-00E | United States | Army Aircraft Navy Carrier- Based Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft Surface Craft |
Sunk | ||
| 14 | KINUGASA | Heavy Cruiser | 8,800 | 8-45S, 157-10E | United States | Navy Carrier- Based Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 15 | KIRISHBIA | Battleship | 31,000 | 9-10S, 159-55E | United States | Surface Craft | Sunk | ||
| 15 | AYANAHI | Destroyer | 1,950 | 9-00S, 159-45E | United States | Surface Craft | Sunk | ||
| 24 | HAYASHIO | Destroyer | 1,900 | 7-00S, 140-30E | United States | Army Aircraft | Sunk | ||
| 30 | TAKANAMI | Destroyer | 1,900 | 9-10S, 159-45E | United States | Surface Craft | Sunk | ||
| 9 Vessels | 81,865 | ||||||||
| December | 10 | 1942 | I 3 | Submarine | 1,995 | 9-14S, 159-40E | United States | Surface Craft | Sunk |
| 12 | TERUTSUKI | Destroyer | 2,450 | 7-50S, 157-30E | United States | Surface Craft | Sunk | ||
| 16 | I 15 | Submarine | 2,212 | 9-10S, 159-30E | United States | Navy Land- Based Aircraft |
Sunk | ||
| 18 | TENRYU | Light Cruiser | 3,300 | 5-11S, 145-57E | United States | Submarine | Sunk | ||
| 20 | I 4 | Submarine | 1,995 | 5-02S, 152-33E | United States | Submarine | Sunk | ||
| 22 | PATROL BOAT NO 35 | Old Destroyer | 750e | 5-05S, 156-04E | United States | Submarine | Sunk | ||
| 25 | I 22 | Submarine | 2,180 | 8-32S, 148-17E | United States | Surface Craft | Sunk | ||
| 7 Vessels | 14,882 | ||||||||
| January | 2 | 1943 | I 18 | Submarine | 2,180 | 8-49S, 157-09E | United States | Submarine | Sunk |
| 10 | OKIKAZE | Destroyer | 1,300 | 35-02N, 140-12E | United States | Submarine | Sunk | ||
| 12 | PATROL BOAT NO 1 | Old Destroyer | 750e | 2-51S, 149-43E | United States | Submarine | Sunk | ||
| 23 | HAKAZE | Destroyer | 1,300 | 2-47S, 150-38E | United States | Submarine | Sunk | ||
| 29 | I 1 | Submarine | 1.995 | 9-13S, 159-37E | New Zealand | Surface Craft | Sunk | ||
| 5 Vessels | 7,525 | ||||||||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| February | 1 | 1943 | MAKIGUMO | Destroyer | 1,900 | 9-10S, 159-45E | United States | Navy line | Sunk |
| 11 | RO 102 | Submarine | 525 | 14-15S, 161-59E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 20 | OSHIO | Destroyer | 1,850 | 00-50S, 146-06E | United States | Submarine | Sunk | ||
| 20 | UNKNOWN | Frigate | 750e | 00-50S, 146-06E | United States | Submarine | Sunk | ||
| 4 Vessels | 5,025 | ||||||||
| March | 3 | 1943 | ARASHIO | Destroyer | 1,850 | 7-15S, 148-30E | United States Australia |
Army Aircraft Aircraft |
Sunk |
| 3 | ASASHIO | Destroyer | 1,850 | 7-10S, 148-15E | United States Australia |
Army Aircraft Aircraft |
Sunk | ||
| 3 | TOKITSUKAZE | Destroyer | 1,900 | 7-15S, 148-30E | United States Australia |
Army Aircraft Aircraft |
Sunk | ||
| 3 | SHIRAYUKI | Destroyer | 1,950 | 7-15S, 148-30E | United States Australia |
Army Aircraft Aircraft |
Sunk | ||
| 6 | MINEGUMO | Destroyer | 1,850 | 8-05S, 157-15E | United States | Surface Craft | Sunk | ||
| 6 | MURASAME | Destroyer | 1,580 | 8-05S, 157-15E | United States | Surface Craft | Sunk | ||
| 6 Vessels | 10,980 | ||||||||
| April | 3 | 1943 | SUBMARINE CHASER NO 13 | Submarine Chaser | 440 | 40-00N, 142-00E | United States | Submarine | Sunk |
| 4 | RO 34 | Submarine | 700 | 8-15S, 158-55E | United States | Surface Craft | Sunk | ||
| 9 | ISONAMI | Destroyer | 1,950 | 5-26S, 123-04E | United States | Submarine | Sunk | ||
| 23 | PATROL BOAT NO 39 | Old Destroyer | 820e | 23-45N, 122-45E | United States | Submarine | Sunk | ||
| 4 Vessels | 3,910 | ||||||||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| May | 8 | 1943 | KUROSHIO | Destroyer | 1,900 | 8-05S, 156-55E | United States | Navy Mine | Sunk |
| 8 | OYASHIO | Destroyer | 1,900 | 8-05S, 156-55E | United States | Navy Land- Based Aircraft Navy Mine |
Sunk | ||
| 8 | KAGERO | Destroyer | 1,900 | 8-05S, 156-55E | United States | Navy Land-Based Aircraft Navy Mine |
Sunk | ||
| 28 | RO 107 | Submarine | 525 | 15-35S, 167-17E | United States | Surface Craft | Sunk | ||
| 4 Vessels | 6,225 | ||||||||
| June | 8 | 1943 | MUTSU | Battleship | 37,500 | 34-05N, 132-20E | Japan | Marine Casualty | Sunk |
| 10 | I 9 | Submarine | 2,443 | 53-16N, 174-24E | United States | Surface Craft | Sunk | ||
| 13 | I 31 | Submarine | 2,212 | 52-08N, 177-38E | United States | Surface Craft | Sunk | ||
| 22 | I 7 | Submarine | 1,995 | 51-49N, 177-20E | United States | Surface Craft | Sunk | ||
| 4 Vessels | 44,150 | ||||||||
| July | 1 | 1943 | RO 101 | Submarine | 525 | 8-39S, 157-35E | United States | Surface Craft | Sunk |
| 6 | NAGATSUKI | Destroyer | 1,500 | 7-57S, 157-12E | United States | Surface Craft | Sunk | ||
| 6 | NIIZUKI | Destroyer | 2,450 | 7-57S, 157-12E | United States | Surface Craft | Sunk | ||
| 11 | I 25 | Submarine | 2,212 | 8-00S, 157-19E | United States | Surface Craft | Sunk | ||
| 13 | JINTSU | Light Cruiser | 5,900 | 7-36S, 157-06E | United States | Surface Craft | Sunk | ||
| 17 | HATSUYUKI | Destroyer | 1,950 | 6-50S, 155-47E | United States | Army Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 20 | KIYONAMI | Destroyer | 2,100 | 7-13S, 156-45E | United States | Army Aircraft Navy Land- |Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 20 | YUGURE | Destroyer | 1,600 | 7-25S, 156-45E | United States | Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| July | 22 | 1943 | NISSHIN | Seaplane Tender | 9,000 | 6-35S, 156-10E | United States | Army Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk |
| 27 | HIRASHIMA | Special Minelayer | 720 | 32-32N, 127-41E | United States | Submarine | Sunk | ||
| 27 | I 24 | Submarine | 2,180 | 2-50S, 149-01E | United States | Submarine | Sunk | ||
| 28 | ARIAKE | Destroyer | 1,600 | 5-27S, 148-25E | United States | Army Aircraft | Sunk | ||
| 28 | MIKATSUKI | Destroyer | 1,500 | 5-27S, 148-25E | United States | Army Aircraft | Sunk | ||
| 13 Vessels | 33,237 | ||||||||
| August | 2 | 1943 | MOTOR TORPEDO BOAT NO 112 | Torpedo Boat | 500e | 6-40S, 146-50E | United States | Army Aircraft | Sunk |
| 2 | MOTOR TORPEDO BOAT NO 113 | Torpedo Boat | 500e | 6-40S, 146-50E | United States | Army Aircraft | Sunk | ||
| 6 | ARASHI | Destroyer | 1,900 | 7-50S, 156-47E | United States | Surface Craft | Sunk | ||
| 6 | HAGIKAZE | Destroyer | 1,900 | 7-50S, 156-47E | United States | Surface Craft | Sunk | ||
| 6 | KAWAKAZE | Destroyer | 1,580 | 7-50S, 156--47E | United States | Surface Craft | Sunk | ||
| 18 | SPECIAL SUBMARINE CHASER NO. 5 | Special Submarine Chaser | 100e | 7-26S, 156--45E | United States | Surface Craft | Sunk | ||
| 18 | SPECIAL SUBMARINE CHASER NO. 12 | Special Submarine Chaser | 100e | 7-26S, 156-45E | United States | Surface Craft | Sunk | ||
| 19 | I 17 | Submarine | 2,212 | 23-26S, 166-50E | United States New Zealand |
Navy Land- Based Aircraft Surface Craft |
Sunk | ||
| 19 | SPECIAL SUBMARINE CHASER NO. 109 | Special Submarine Chaser | 200 | 3-01S, 125-50E | United States | Submarine | Sunk | ||
| 25 | I 178 | Submarine | 1,630 | 12-57S, 164-23E | United States | Surface Craft | Sunk | ||
| 10 Vessels | 10,622 | ||||||||
| September | 2 | 1943 | MUTSURE | Frigate | 860 | 8-40N, 151-31E | United States | Submarine | Sunk |
| 3 | I 168 | Submarine | 1,785 | 13-10S, 165-28E | United States | Surface Craft | Sunk | ||
| 9 | I 182 | Submarine | 1,630 | 10-33N, 125-31E | United States | Submarine | Sunk | ||
| 11 | MINESWEEPER NO 16 | Minesweeper | 492 | 6-08S, 119-20E | Australia | Mine | Sunk | ||
| 15 | RO 103 | Submarine | 525 | 10-57S, 163-56E | United States | Navy Land- Based Aircraft Surface Craft |
Sunk | ||
| 26 | KASASAGI | Torpedo Boat | 595 | 5-50S, 121-57E | United States | Submarine | Sunk | ||
| 30 | PETEREL | River Gunboat | 310 | 21-12N, 110-24E | United States | Army Aircraft | Sunk | ||
| 7 Vessels | 6,197 | ||||||||
| October | 1 | 1943 | I 20 | Submarine | 2,180 | 7-40S, 157-10E | United States | Surface Craft | Sunk |
| 6 | YUGUMO | Destroyer | 1,900 | 7-32S, 156-20E | United States | Surface Craft | Sunk | ||
| 12 | BOKO | Special Minelayer | 400e | 4-35S, 152-11E | United States | Army Aircraft | Sunk | ||
| 16 | SPECIAL SUBMARINE CHASER NO 31 | Special Submarine Chaser | 100 | 4-00S, 152-00E | United States | Army Aircraft | Sunk | ||
| 24 | MOCHITSUKI | Destroyer | 1,500 | 5-42S, 151-40E | United States | Navy Land- Based Aircraft |
Sunk | ||
| 5 Vessels | 6,080 | ||||||||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| November | 2 | 1943 | SENDAI | Light Cruiser | 5,900 | 6-20S, 154-20E | United States | Surface Craft | Sunk |
| 2 | HATSUKAZE | Destroyer | 1,900 | 6-20S, 154-20E | United States | Surface Craft | Sunk | ||
| 2 | MINESWEEPER NO. 26 | Minesweeper | 500e | 4-13S, 152-11E | United States | Army Aircraft | Sunk | ||
| 4 | TSUKUSHI | Surveying Ship | 2,000e | 2-40S, 150-40E | Australia | Mine | Sunk | ||
| 4 | SPECIAL SUBMARINE CHASER No 30 | Special Submarine Chaser | 100 | 7-34N, 134-0E | United States | Submarine | Sunk | ||
| 6 | SUBMARINE CHASER NO 11 | Submarine Chaser | 270 | 5-26S, 154-33E | United States | Army Aircraft | Sunk | ||
| 11 | SUZUNAMI | Destroyer | 2,100 | 4-13S, 152-11E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 12 | I 34 | Submarine | 2,212 | 5-17N, 100-05E | Great Britain | Submarine | Sunk | ||
| 16 | UKISHIMA | Special Minelayer | 720 | Off Japan | Unknown | Unknown | Sunk | ||
| 18 | SANAYE | Old Destroyer | 820 | 4-52N, 122-07E | United States | Submarine | Sunk | ||
| 23 | I 35 | Submarine | 2,212 | 1-22N, 172-47E | United States | Surface Craft | Sunk | ||
| 23 | WAKAMIYA | Frigate | 860 | 28-49N, 122-11E | United States | Submarine | Sunk | ||
| 25 | I 19 | Submarine | 2,212 | 3-10N, 171-55E | United States | Surface Craft | Sunk | ||
| 25 | YUGIRI | Destroyer | 1,950 | 4-48S, 153-55E | United States | Surface Craft | Sunk | ||
| 25 | MAKINAMI | Destroyer | 1,900 | 5-06S, 153-44E | United States | Surface Craft | Sunk | ||
| 25 | ONAMI | Destroyer | 2.100 | 5-06S, 153-44E | United States | Surface Craft | Sunk | ||
| 16 Vessels | 27,756 | ||||||||
| December | - | 1943 | RO 38 | Submarine | 965 | Pacific Ocean | Unknown | Unknown | Sunk |
| 4 | CHUYO | Escort Aircraft Carrier | 20,000 | 32-37N, 143-39E | United States | Submarine | Sunk | ||
| 16 | I 179 | Submarine | 1,630 | 4-28S, 147-22E | United States | Navy Land- Based Aircraft |
Sunk | ||
| 19 | NUMAKAZE | Destroyer | 1,300 | 26-29N, 128-26E | United States | Submarine | Sunk | ||
| 20 | FUYO | Old Destroyer | 820 | 14-44N, 119-55E | United States | Submarine | Sunk | ||
| 23 | I 39 | Submarine | 2,212 | 9-23S, 160-09E | United States | Surface Craft | Sunk | ||
| 23 | NANYO | Gunboat | 1,200 | 25-30N, 119-30E | United States | Army Aircraft | Sunk | ||
| 25 | MINESWEEPER NO 31 | Minesweeper | 492 | 2-36S, 150-49E | United States | Navy Carrier- Based Aircraft |
Probably sunk | ||
| 8 Vessels | 28,619 | ||||||||
| January | - | 1944 | I 181 | Submarine | 1,630 | Off New Guinea | Unknown | Unknown | Sunk |
| 11 | KUMA | Light Cruiser | 5,700 | 6-00N, 99-00E | Great Britain | Submarine | Sunk | ||
| 14 | SAZANAMI | Destroyer | 1,950 | 5-15N, 141-15E | United States | Submarine | Sunk | ||
| 15 | PING SANG | Yacht | 171 | 21-00N, 107-22E | United States | Army Aircraft | Sunk | ||
| 22 | I 48 | Submarine | 2,180 | 9-45N, 138-20E | United States | Surface Craft | Sunk | ||
| 22 | RO 37 | Submarine | 965 | 11-47S, 164-17E | United States | Surface Craft | Sunk | ||
| 22 | SPECIAL SUBMARINE CHASER NO 40 | Special Submarine Chaser | 100 | 1-50S, 147-20E | United States | Army Aircraft | Sunk | ||
| 26 | SPECIAL SUBMARINE CHASER NO 14 | Special Submarine Chaser | 130 | 11-10N, 163-25E | United States | Navy Land- Based Aircraft |
Sunk | ||
| 26 | SUZUKAZE | Destroyer | 1,580 | 8-51N, 157-10E | United States | Submarine | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| January | 30 | 1944 | SPECIAL SUBMARINE CHASER NO. 28 | Special Submarine Chaser | 100 | 8-42N, 167-441 | United States | Navy Carrier- Based Aircraft Surface Craft. |
Sunk |
| 30 | SPECIAL SUBMARINE CHASER NO. 25 | Special Submarine Chaser | 100 | 8-42N, 167-44E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 30 | SPECIAL SUBMARINE CHASER NO. 21 | Special Submarine Chaser | 100 | 8-42N, 167-44E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 30 | SPECIAL SUBMARINE CHASER NO. 19 | Special Submarine Chaser | 100 | 8-42N, 167-44E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 30 | SPECIAL SUBMARINE CHASER NO. 18 | Special Submarine Chaser | 100 | 8-42N, 167-44E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 31 | I 171 | Submarine | 1,785 | 5-37S, 154-14E | United States | Surface Craft | Sunk | ||
| 31 | SPECIAL SUBMARINE CHASER NO. 33 | Special Submarine Chaser | 100 | 8-42N, 167-44E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 31 | NASAMI | Special Minelayer | 443 | 9-50N, 147-06E | United States | Submarine | Sunk | ||
| 17 Vessels | 17,234 | ||||||||
| February | - | 1944 | I 40 | Submarine | 2,212 | Marshall Islands | Unknown | Unknown | Sunk |
| 1 | RO 39 | Submarine | 965 | 9-24N, 170-32E | United States | Surface Craft | Sunk | ||
| 1 | UMIKAZE | Destroyer | 1,580 | 7-10N, 151-43E | United States | Submarine | Sunk | ||
| 4 | I 21 | Submarine | 2,212 | 6-48N, 168-08E | United States | Surface Craft | Sunk | ||
| 10 | MINEKAZE | Destroyer | 1,300 | 23-12N, 121-30E | United States | Submarine | Sunk | ||
| 11 | RO 110 | Submarine | 525 | 17-25N, 83-21E | Australia India |
Surface Craft Surface Craft |
Sunk | ||
| 12 | I 27 | Submarine | 2,212 | 1-25N, 72-22E | Great Britain | Surface Craft | Sunk | ||
| 15 | I 43 | Submarine | 2,212 | 12-42N, 49-17E | United States | Submarine | Sunk | ||
| 16 | RO 40 | Submarine | 965 | 9-50N, 166-35E | United States | Surface Craft | Sunk | ||
| 16 | SPECIAL SUBMARINE CHASER No. 10 | Special Submarine Chaser | 100e | 2-24S, 150-06E | United States | Army Aircraft | Sunk | ||
| 16 | AGANO | Light Cruiser | 7,000 | 10-11N, 151-42E | United States | Submarine | Sunk | ||
| 17 | I 11 | Submarine | 2,443 | 10-34N, 173-31E | United States | Surface Craft | Sunk | ||
| 17 | SUBMARINE CHASER NO 24 | Submarine Chaser | 300 | 7-24N, 150-30E | United States | Surface Craft | Sunk | ||
| 17 | NAKA | Light Cruiser | 5,900 | 7-15N, 151-15E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | FUMITSUKI | Destroyer | 1,500 | 7-24N, 151-44E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | TACHIKAZE | Destroyer | 1,300 | 7-04N, 151-55E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| Date | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | |||
| February | 17 | 1944 | MAIKAZE | Destroyer | 1,900 | 7-45N, 151-20E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk |
| 17 | OITE | Destroyer | 1,270 | 7-40N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | SUBMARINE CHASER NO 29 | Submarine Chaser | 270 | 7-25N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | SPECIAL SUBMARINE CHASER NO 29 | Special Submarine Chaser | 100e | 2-24S, 150-06E | United States | Army Aircraft | Sunk | ||
| 17 | SUBMARINE CHASER NO 39 | Submarine Chaser | 300 | 2-24S, 150-06E | United States | Army Aircraft | Sunk | ||
| 17 | KATORI | Training Cruiser | 6,000 | 7-45N, 151-20E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 19 | SPECIAL SUBMARINE CHASER NO 34 | Special Submarine Chaser | 100e | 2-45S, 150-47E | United States | Army Aircraft | Sunk | ||
| 19 | SUBMARINE CHASER NO 22 | Submarine Chaser | 300 | 3-04S, 150-42E | United States | Army Aircraft | Sunk | ||
| 19 | SUBMARINE CHASER NO 40 | Submarine Chaser | 300 | 3-04S, 150-42E | United States | Army Aircraft | Sank | ||
| 21 | SPECIAL SUBMARINE CHASER NO 48 | Special Submarine Chaser | 100 | 2-30S, 150-15E | United States | Army Aircraft | Sunk | ||
| 22 | NATSUSHIMA | Special Minelayer | 443 | 2-40S, 149-40E | United States | Surface Craft | Sunk | ||
| 22 | NAGAURA | Tug | 800e | 00-54S, 148-38E | United States | Surface Craft | Sank | ||
| 22 | FRANCIS GARNIER | River Gunboat | 639 | 10-30N, 108-00E | United States | Army Mine | Sunk | ||
| 26 | ASTROLABE | Surveying Ship | 215 | 16-04N, 108-13E | United States | Army Aircraft | Sank | ||
| 30 Vessels | 45,463 | ||||||||
| March | 3 | 1944 | KARATSU | River Gunboat | 560 | 8-52N, 123-23E | United States | Submarine | Sunk |
| 4 | SHIRAKAMI | Special Minelayer | 720 | 39-30N, 142-00E | Japan | Marine Casualty | Sunk | ||
| 13 | TATSUTA | Light Cruiser | 3,300 | 32-58N, 138-52E | United States | Submarine | Sunk | ||
| 16 | SHIRAKUMO | Destroyer | 1,950 | 42-25N, 144-55E | United States | Submarine | Sunk | ||
| 19 | SPECIAL SUBMARINE CHASER NO 47 | Special Submarine Chaser | 100 | 2-55S, 143-40E | United States | Army Aircraft | Sunk | ||
| 19 | SPECIAL SUBMARINE CHASER NO 49 | Special Submarine Chaser | 100 | 2-55S, 143-40E | United States | Army Aircraft | Sank | ||
| 23 | I 42 | Submarine | 2,212 | 6-40N, 134-03E | United States | Submarine | Sunk | ||
| 24 | I 32 | Submarine | 2,212 | 8-30N, 170-10E | United States | Surface Craft | Sank | ||
| 25 | SUBMARINE CHASER NO 54 | Submarine Chaser | 300 | 28-34N, 142-14E | United States | Submarine | Sunk | ||
| 30 | WAKATAKE | Old Destroyer | 820 | 7-50N, 134-20E | United States | Navy Carrier- Based Aircraft |
Sank | ||
| 30 | PATROL BOAT NO 31 | Old Destroyer | 750e | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | SPECIAL SUBMARINE CHASER NO 22 | Special Submarine Chaser | 100 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sank | ||
| Date | Name of Vessel | Type of Vessel | Standard Tonnage |
Location | Flag of Agent | Type of Agent | Assessment | ||
| March | 30 | 1944 | SPECIAL SUBMARINE CHASER NO 26 | Special Submarine Chaser | 100 | 7-30N, 134-30E | United States | Navy Carrier-Based Aircraft | Sunk |
| 30 | SPECIAL SUBMARINE CHASER NO 53 | Special Submarine Chaser | 170 | 7-30N, 134-30E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 30 | SUBMARINE CHASER NO 6 | Submarine Chaser | 270 | 7-30N, 134-30E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 30 | AKASHI | Repair Ship | 9,000 | 7-30N, 134-30E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 16 Vessels | 22,664 | ||||||||
| April | 4 | 1944 | I 169 | Submarine | 1,785 | 7-25N, 151-50E | Japan | Marine Casualty | Sunk |
| 5 | SPECIAL SUBMARINE CHASER NO 46 | Special Submarine Chaser | 130 | 7-26N, 151-52E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 6 | I 2 | Submarine | 1,995 | 2-17S, 149-14E | United States | Surface Craft | Sunk | ||
| 11 | AKIGUMO | Destroyer | 1,900 | 6-43N, 122-23E | United States | Submarine | Sunk | ||
| 13 | IKAZUCHI | Destroyer | 1,950 | 10-13N, 143-51E | United States | Submarine | Sunk | ||
| 15 | MINESWEEPER NO 7 | Minesweeper | 630 | 11-34N,93-08E | Great Britain | Submarine | Sunk | ||
| 20 | RO 45 | Submarine | 965 | 15-19N, 145-31E | United States | Submarine | Sunk | ||
| 22 | HOKUAN | Salvage Vessel | 534 | 7-10N, 99-20E | Great Britain | Submarine | Sunk | ||
| 23 | AMAGIRI | Destroyer | 1,950 | 2-10S, 116-45E | United States | Army Mine | Sunk | ||
| 26 | I 180 | Submarine | 1,630 | 55-10N, 155-40W | United States | Surface Craft | Sank | ||
| 27 | KAMONE | Special Minelayer | 450 | 27-37N, 128-11E | United States | Submarine | Sunk | ||
| 27 | YUBARI | Light Cruiser | 3,500 | 5-20N, 132-16E | United States | Submarine | Sunk | ||
| 28 | I 183 | Submarine | 1,630 | 32-07N, 133-03E | United States | Submarine | Sunk | ||
| 29 | I 174 | Submarine | 1,785 | 6-13N, 151-19E | United States | Navy Carrier-Based Aircraft Surface Craft | Sunk | ||
| 29 | TAHURE | River Gunboat | 644 | 13-02N, 109-28E | United States | Submarine | Sunk | ||
| 30 | SPECIAL SUBMARINE CHASER NO 38 | Special Submarine Chaser | 100 | 7-22N, 151-45E | United States | Navy Carrier- Based Aircraft | Sank | ||
| 16 Vessels | 21,578 | ||||||||
| May | 10 | 1944 | KARUKAYA | Old Destroyer | 820 | 15-38N, 119-25E | United States | Submarine | Sunk |
| 13 | RO 501 | Submarine | 1,200 | 18-08N, 33-13W | United State | Surface Craft | Sank | ||
| 14 | INAZUMA | Destroyer | 1,950 | 5-08N, 119-38E | United States | Submarine | Sunk | ||
| 16 | I 176 | Submarine | 1,630 | 4-01S,156-29E | United States | Surface Craft | Sunk | ||
| 19 | I 16 | Submarine | 2,180 | 5-10S, 158-17E | United States | Surface Craft | Sank | ||
| 21 | RO 106 | Submarine | 525 | 1-40N, 150-31E | United States | Surface Craft | Sunk | ||
| 22 | RO 104 | Submarine | 525 | 1-26N, 149-20E | United States | Surface Craft | Sunk | ||
| 22 | HASHIDATE | Gunboat | 1,200 | 2 | |||||