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I don't have a URL, but I saw a post on a blog about this just now.
Apparently the guy had a hand-rigged pully system lifting paint cans full of dirt out of the hole, and the guys he had down in the hole were sucking on a garden hose for air (carbon dioxide being heavier than air, after all, and with a few guys working hard down the hole, I'm sure they filled the hole with Oxygen-depleted air pretty quick).
This was a major excavation that was completely jury-rigged. He should have been stopped before he passed 10 feet.
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