I did dive depth tests a while back with a few subs and one of the interesting things i discovered was that prolonged exposure to depths could suddenly end your career. I got down to the bottom of the gauge and was cruising along and then suddenly i sank. (soz i can't remember which subs it happened in)
With slight damage incurred, there is a possibility that 70 meters was close to the damage modified crush depth and this prolonged exposure caused the sudden sinking. I won't claim to know anything about real submarines, just stating what the game has done to my ship on several occasions.
Just because your ship is resisting an elevated pressure at the moment, doesn't mean it will necessarily survive at that depth forever.
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