I've taken my Balao to 840 feet (IIRC) before it imploded.
oddly, if you just hit the dive key, it will automagically level out at 600 feet, if you have any way on you. If you bring the boat to all stop, it will eventually continue to sink, with the bow planes in the full up position, until you hit the depth at which it starts to break and eventually crush.
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