Wally Cox was the sonar man who went deaf after working too long.
BTW..Wally Cox was on the very first episode of Misson Impossible. He played a safe cracker.
Hmm I am almost certain Wally Cox was exhausted and the captain had him shot up with amphetmines to stay awake, and so he was all out of it and fires the missile when he hears Richard Widmark say the words “fire one” but that’s pure memory now you will all make me check if it was James McCarthur.