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Thanks so much, that answered it!! I can't imagine how it works and keeps the water out, but all that matters is that it does!Fill your kitchen sink with water. Take a clear glass and push the open end straight down into the water. See the air trapped in the glass? That's the way the helmet works. The air inside can't get out, it's trapped in the helmet by its natural tendency to go up. Water won't come in since there's constant pressure inside the helmet.