This was in SH5, but I had 48% hull damage the other night. I test dove to 40m and all was quiet so I felt safe. Then I came across a destroyer who had me pegged. I dropped to 50m, nothing, but I couldn't lose the destroyer! Inched down to 80m... way risking it! But still I didn't pop. Still couldn't shake the escort though.
Finally pushed it to 90m. Every additional meter scared the pants off me, but still things were solid. Depth charges kept falling lower and lower though and getting closer to me. Decided to risk 100m. Got to 101... no loud noises or anything, so I guess I was---CRASH! BANG! Moments later I was dead. Imploded with about 2 seconds warning.
That's one thing I always wished took longer in all the Silent Hunter games. Once you reach crush depth it's basically instant. You have maybe 2 seconds to realize what's happening then you're dead. I'm fairly certainly it wasn't that quick and final in real life, you'd have more clues that your hull is about to cave in rather than going from "Everything is fine captain" to "squished like an egg".
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