The problem with crush depth is that it's impossible to determine it exactly without getting crushed, so real-life tests are nonexistant. Some u-boats did indeed survive going to 260 meters and deeper (I think one reported surviving 280). On the other hand we have no way of knowing about ones that got crushed at 230, or 210, since they didn't report it.
At least one US sub reported surviving more than 600 feet, which while not deep by Type VII standards is still deeper than they were supposedly rated for. Type IXs were also less safe, being larger than the Type VII.
SH3 has two different mods available that vary the crush depth from session to session, so you never know what's going to be safe. Does SH5 have something similar? I don't know.
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