[seafarer]

:hmm: who knows, certainly more idiotic information was openly given to the enemy. Congressman Andrew J. May gave away the fact that Japanese depth charges were being fused too shallow in a 1943 press conference (the IJN did not believe US subs could dive as deep as they did). That was published in a number of news papers, including papers in Hawaii. Admiral Lockwood later estimated that blunder may have cost the US as many as 10 boats.

Tokyo Rose got a lot of her info by listening to US mainland-based short-wave broadcasts, which some WWII accounts refer to as a leaking sieve of valuable information.