I've read somehwere that the depth difference must by about 200ft. I guees it was Sub Command related. But it can be the same thing here. Such big depth difference make it almost useless.
The problem was that torpedo indeed did not cross preset cieling. It did acquire the surface target however, which can even be realistic, hard to tell how good sonar processor on the torpedo is. 'Don't cross 10m depth' is much simplier to do than 'don't lock on targets above 10m,however distant they are'.
The only problematic part was that torpedo exploded even under the ship. Like if it had too sensitive magnetic detonator.
If you shot from under the tanker, of course the torpedo did not explode, because it did not enable.
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