I'm saying two things. First, I want to know whether these devices work a week or two from now after the internals would have had time to corrode... if they were going to corrode in the first place. (Again, I'm open to the idea that these devices really are water proof at shallow depths for indefinite periods of submersion, but I want to see these followup tests.)

The second thing is about water pressure, which you highlighted as the key factor in water resistance.