No amount of money paid to me would be enough to get me in one of those things, same with pot holing.
I once did a glass bottom boat to Peacock Island from Benidorm, it included a small trip in a tourist submarine, I was ok in that as there was loads of room but my mate was sick as a dog due to the feeling of being “trapped”.
I’ve also been on avNuclear Sub next to the USA warship The Intrepid in dry dock in New York, it brings it home how tiny and claustrophobic the conditions are. No way I’d go to sea in one of those never mind a Tin Can that squeezes 5 people in.