Does anyone have an idea on how to find a leak in a pontoon boat bladder? It is a small hole. I could not see one while looking for it. Unfortunately, i don't have a tub large enough to submerge the bladder in, so I need some alternatives.

Thanks!
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Your reality, sir, is lies and balderdash, and I am delighted to say that I have no grasp of it whatsoever!
-The Adventures of Baron Munchausen