US submarine sunk large Japanese merchant ship according to the U.S. Joint Intelligence Committee. Daily summary dated 30 January 1942

An item reported that a patrolling US submarine sunk a Japanese merchant ship with an estimated tonnage of 7,000 tons in the East China Sea.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 51 dated 30 January 1942