first one: (source Combined Fleet website)
29 May 1942:
Balabac Strait, N of Borneo. LtCdr (later Rear Admiral) Chester C. Smith's (USNA ’25) USS SWORDFISH (SS-193) operating from Fremantle, Australia, is patrolling the Strait. Smith’s lookouts spot a small convoy and he sets up for a submerged night attack. Smith fires two Mark 14 steam torpedoes at what he identifies at a “5,000-ton” oiler, but claims no hits.
Actually, one of his torpedoes hits RIO MARU and rips open a 46-foot long by 26-foot wide hole in Hold No. 1. Smith then attacks another ship in the convoy and fires two torpedoes at it. He hits and sinks IJA transport TATSUFUKU MARU with the loss of 12 crewmen and 36 troops.
Six sailors volunteer to enter RIO MARU's flooded compartment and seal the leak. Later, they receive a commendation from the CINC, Combined Fleet, Admiral (Fleet Admiral posthumously) Yamamoto Isoroku (32) (former CO of AKAGI). Repair ships KASUGA MARU and YAMABIKO MARU arrive later and tow RIO MARU to Singapore for repairs.
27 July 1942:
94 miles E of Camranh, Indochina. RIO MARU is attacked by LtCdr (later Rear Admiral) James C. Dempsey's (USNA ’31) (former CO of USS S-37) USS SPEARFISH (SS-190). Dempsey later claims two hits of four torpedoes he fires in a submerged night attack. He departs thinking the stopped ship is sinking by the stern. The next day, Captain Ohashi reports RIO MARU suffered "medium" damage, but is able to proceed to Hong Kong for repairs.
Both the swordfish and spearfish were Sargo class submarines. The sub in the picture looks like a Neptun Gato class. However, the differences would be very hard to discern as dimensions were nearly identical.
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