[Torplexed]

So true. Active radar and sonar have been compared to wielding a flashlight in a dark room full of people with guns trying to kill you. You might see one of them. They'll certainly ALL see you. Wasn't too big a concern for the Allies during the war as they usually had the technological edge in radar and sonar sets, and the Japanese and Germans were slow to catch up in electronic detection devices. But that's why passive sensors become so popular in the postwar era.