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Yeah that worried me a bit aswell. But you do not really feel trapped when you manage to relax, instead i felt as would i lay in an ocean and no land in sight :)
Those tanks usually have an emergency button, so they are really safe to use. If you do not lay in there with your face pointing downwards, there is not a whole lot that can go wrong ;)

Hm I think not being able to open the door myself would freak me out. How is the air inside of the tank? Is it circulated at all?

You can open the door yourselve, no worries. The air is conditionend and circulating. You can talk to the employees if you want it to be rather warm or cool.
A good floating center will also show you around for free and comfort your worries.

Please let me hear back when u decide to go :)

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