This is a known issue...
The "sudden death" syndrome. It is due to the damage model and a certain situation where a "domino effect" continues to add and actually multiply damage when at depths.
There are a few mods that address it. Die slowly is one such mod.
Of course it is also possible that you had bulkheads damaged to the extent that they could not take the pressures at depth, or you may have run into a mine, or you may have run into the bottom.
The damage control screen will occasionaly tell you your bulkheads are at 100% when there not.
Next time you have taken a severe beating think twice about taking her deep.
Lastly... Save early save often.
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