I have to wonder about some of the details. The heating, in the first place. I used to dive a bit, and was never cold in a wetsuit, even in places like Monterey Bay, or Lake Tahoe in January. Then it would have to be a pretty small jellyfish to be sucked into the pump (and survive!) and pushed down a narrow garden hose.
Then too, if he was working at any depth (as the number of decompresson stops suggests) wouldn't the water in the uninsulated garden hose cool off?
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