Hm....I dunno. I haven't tried to take it any deeper than 30 feet or so yet. It's...sorta experimental. I'm sure there's some kinda limit but I don't know what it is.

And like I said, it's in my room. Up against the wall. It not that big... When its got trapped air inflating it, it's only big enough for one or two people's upper body. But it's made of a metal frame and a thick plastic sheet and doesn't take up much room...