My real question is; what are the limits or parameters for what destroyers/sub chasers can detect? I had an incident when I was set up on a convoy, heavy rain/bad visibility, day time. I was rigged for silent running and at periscope depth, waiting for the convoy. Of course, the destroyer came through the kill zone first, on a direct path to go right over me. So knowing this in advance, I dropped periscope, and dropped depth by 20 feet, hoping the destroyer would pass over me undetected. The destroyer was still not visible at this point so I know I couldn't have been, and he had to have been 1500+ yards away.
As I was approx. 80+ feet under, the damned destroyer pinged me and went straight for me with depth charges, ruining my ambush. What I don't get is HOW he detected me. Can anyone explain the limits of what they can and can't do in that situation?
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