Japan claimed to have destroyed at least to have 9 Allied submarine according to the U.S. Joint Intelligence Committee. Daily summary dated 22 December 1941

An item referred to the Japanese press reporting that 9 Allied submarines were sunk and 4 possible without supplying their nationality. A Japanese destroyer sunk the day before one submarine picking up 32 survivors.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 12 dated 22 December 1941.