21 Feb 1943

Dutch East Indies
  • Within hours of arriving on station in the southeast Flores Sea, submarine USS Thresher intercepted a Japanese convoy of three large transports plus escorts. Thresher fired a total of eight torpedoes at the transports, severely damaging the 7,000-ton Kuwayama Maru at least and possibly damaging another transport. ww2dbase [Thresher | Flores Sea | DS]
22 Feb 1943

Dutch East Indies
  • Submarine USS Thresher circled back to the area of the previous day's attack and found the 7,000-ton Kuwayama Maru abandoned, dead in the water, and settled to decks awash. Despite Kuwayama Maru being deep in the water drawing about 26 feet, Thresher's first torpedo was seen to go under the transport. Thresher's second torpedo was a solid hit but did not explode. The third torpedo was also a solid hit without exploding. Thresher evaded a Kuma-class cruiser while setting up a fourth attack on the crippled transport. Thresher's fourth torpedo exploded and blew the ship in two. Kuwayama Maru sank in less than three minutes. ww2dbase [Thresher | Flores Sea | DS]
28 Feb 1943

Dutch East Indies
  • Submarine USS Thresher shifted from the southern Flores Sea to the northern Flores Sea on a report of a Japanese submarine transiting the Makassar Strait. ww2dbase [Thresher | Flores Sea | DS]



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