OMG one of my old friends had a trampoline set up like this, it wasn't too deep under though, so I used to go hide under it while we were playing tag, man hunt, or hide and seek
I know where it is, it's next to my old treehouse in a forestry area. Me an 5 other kids set up pretty much an outside playground for ourselves when we were about 10, nobody but us knew about it. Best childhood ever
My cousins have one of these and it's only a little pit. You can see through it because of the little holes in the trampoline. There was a snake under it one time, though...
Your highness *bows*