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"the cockpit has a full electrically heated suit underneath the seat..."
What use was that if he could hardly move inside the small space?

And why didn't he cool down the sub's inside before diving, instead of first having it too hot and then too cold? And why didn't he have any insulating sheet between his leg and the wall? That would hardly have taken any space. And the condensation shouldn't have been anything new or unexpected either. Seeing as he planned this for seven years, I think he was surprisingly unprepared for even the simplest of obstacles.