I once worked for a gas-well testing company. Not your run of the mill easy-peasy joints, a bizzare and deadly specialized company that dealt with only the most dangerous and toxic and unpredictable wells in the world.

We (myself and our ten man crew) were working a massive job. It took forty full sized semi trailers to bring in our gear. It took twenty of us, both the day and the night shift, ten days to set it all up at fourteen hour days.

Once we opened up the well to our equipment everything was running smoothly for a few days. However, a seemingly overlookked issue was pressing back unnoticed. Our main pressure tank, fit for 5,000 psi has a hatch. A three inch thick, solid steel, circular hatch affixed to the unit with exactly twenty bolts, each nut the size of a grown man's fist.

These nuts, well they were under such a mighty force that they began to undo themselves. So we would hang wrenches from the ones moving the most so that if they loosened, the wrench would lock and immobilize the nut as the wrench would begin to press against another nut.

I cannot tell you how uncomfortable you feel watching enormous nuts unwind themselves as the equipment you have makes eerie whale song at you. Bweeeeeeuuhh, squeeeeeeee^eeee, and the constant steamish hiss of the poison gas flowing throuh your tanks.

Four good men were gassed on that job, all but one lived, and the survivors have serious cognitive malfunctions. Short term memory problems, spoiled seed, and one guy with a peculiar issue where he cannot feel the sensation of wetness.