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frankenbike
If the limiting survival factor is holding one’s breath while the cabin floods, perhaps it’s best to flood the cabin quickly by opening the windows at the start? You’d sink quicker but there would still be some air in the carriage body to slow the descent.
Allowing the interior to flood slowly risks a trapped air bubble keeping the doors closed. If you sink below 30m, even if you managed to breath from an air bubble, your risk of nitrogen toxicity/ narcosis increases significantly.