How do you tell that an airbed has a hole in it ?

Question

I have 2 air beds and on of them has a hole i just can't remember

witch one HELP PLEASE!!!!!

Answer 1

blow them both up and rub down with water then look for bubbles

Answer 2

You could blow both of them up, and see which one goes flat. Then to find the hole to fix, blow it up again and listen for the hole. Or put it in a pool and see where the bubbles come up.

But I don't know why this would be in Water Sports.