Is there any record of surface ships using hydrophones during the Battle of Empress Augusta Bay?
Short answerProbably not on the American side: the Clevelands likely did not carry them and the destroyers were unlikely to use them at speed, while Japanese use remains uncertain.
NotesThe Cleveland-class cruisers probably did not carry hydrophones, and the speed of the American destroyers made their use unlikely during the action. Japanese use remains uncertain. No such use is recalled from the Japanese accounts, but that does not establish that it never occurred. The relevant reference book was unavailable for checking.