Hi,
To be honest I'm not certain. :(
The only thing I can think of is he managed to flip the hide and get himself jammed between the edge of it and either the floor or the top of the tub.
The only things in there were the hide and a heavy ceramic waterbowl he couldn't have shifted. :confused:
The hide was a plastic plant pot drip tray with a door cut in it - which made it a lot more bendable than a hole in the top would have.
dr del