Agree, the door may not be within reach while you are strapped in. The idea is to hold onto a reference point, not necessarily the door handle. You may need to swim to the door, but never without a handhold.

There's a thought process involved; mentally take yourself through the steps and various handholds to get to the door. Once underwater and inverted, the handholds are still where they were relatively speaking.
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Better is the Enemy of Good Enough.
Okay, what’s your point??