I stayed in one once. It was a total disaster and I was so glad when I got out.
First, it was amazing to see how far we've come to be capable of this and seeing all the amazing sea life around you, but it quickly went wrong as the owner started getting really overbearing. He had some weird warped ideas of the world and as he had built the place, he thought it was okay to subject people to his ideology. I wouldn't have minded that much if I could simply leave, but I couldn't.
As things went on, it got worse too. They then found these slug like creatures and that gave us weird abilities, then little girls started going missing and these giant metal robot like monstrosities appeared with the little girls. They basically protected the little girls as they ran around the place sticking needles into the sadly departed. Then a civil war broke out...it was horrible! I'm lucky to get out alive.
Never again.