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09-19-2007, 12:04 PM | #11 | |
Senior Member
Join Date: Jul 2002
Location: Pennsyltuckey, Tuftonboro, Moultonborough
Posts: 1,495
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Quote:
Here's a good page that describes their use. And here's a photo a multiple large bags being used to bring up a freight train car. I've only used a small one (~50 pounds of lift) to help bring comparatively small items to the surface. I stopped into Dive Winnipesaukee in February a few years ago, and Tom had a bunch of big ones out on the floor drying. He had spent the day working to raise a pickup truck with a plow that had gone through the ice in Tuftonboro (I believe there were photos on this site). The problem with that recovery was the thin ice surrounding the hole. Now there's a tough day's work. I'd love to watch them raise a 24-foot boat, and would be interested to know how much air to add at 100+ feet (as the air expands during ascent).
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"When I die, please don't let my wife sell my dive gear for what I told her I paid for it." |
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