a set of teeth........

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JohnL:This summer I came across a "pillar" of something tightly wrapped with loads of line and lobster pot buoys. Obviously man made...and quite odd. It was in about 40 feet of water and seemed to go almost to the surface.
Three of us were swimming along and we all came to a dead stop and started to look back and forth at each other. Very strange, I need to go back and get a picture.
Tom Winters:I was working for a Japanese dive company in Honolulu. I had descended to 100' off Waikiki with my four customers. I turned around and there next to me was the captain of the boat who had FREEDIVED to the bottom.
He waved and then casually returned to the surface. Not having any eardrums made it easy enough for him to go that deep quickly.