Nice and complete test, Myron. I think I remarked in the other thread about
the water pressure forcing the air out of the waders, and the belt and top snug
tie-off will prevent any water from replacing the air. The two times that I
went swimming in waders I was wearing a very snug belt and had the top string
tight around my chest. Water got in the top part and trickled into my legs,
but it was not enough to prevent me from walking or getting out of the stream.

Great test and thanks for reporting it.