I thought of the aquarium water dome in that hotel in Berlin that recently, just a few months ago, just burst unexpectely, out of the blue. The American company that made the acryl glass still has not said/could not say what and why it happened.
I think of the submersible's quoted safety issues, missing certifications, problems with electric system and batteries - and the non-certitfied "ring" that connected the bow's bubble window with the main hull.
Pressure is a mighty enemy if you have to work against it.
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If you feel nuts, consult an expert.
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