That would be fucking cool.
I know there would be some difficulties making that thing to withstand the water pressure but those things could be made fairly cheaply and efficiently. There must be something to do with regulations and stuff that make them rare.
I know I'm talking shit a bit here but they should be a bit more common I'd think.
A version of that is absolutely doable.
"Imagine waking up to sharks just swimming over your head!" says the narrator, as some random dude with a snorkel swims over the top staring down into the room.
"Imagine waking up to sharks just swimming over your head!" says the narrator, as some random dude with a snorkel swims over the top staring down into the room.