A few years back there was a boy up North who had both of his arms ripped off after making a big mistake with a piece of farming equipment, he kept his cool and made it back to the house but no one was there, had to go through a lot of hoops to get help but did so.
One of the most amazing survival stories is that of Hugh Glass, the mountain man who was mauled by a grizzly and assumed dead by his companions. They left him, but Glass survived and journeyed hundreds of miles on foot (often crawling) to make it back to civilization.
My Dad was plant manager at a soda pop plant in the 60's and 70's, he had an employee once who ran afoul of a palletizer, which is a large piece of conveyor gear that swings down and pushes cases of soda pop onto a pallet. The man got onto the conveyor to do something without disabling the machine, and when his foot broke the photoeye beam he was promptly palletized. It knocked him flat on his back, then rotated 90 degrees - ripping off the top of his rib cage and leaving his innards exposed to plain view. He immediately reached up to hold it in. He remained lucid while they waited on ambulance, told Dad he was probably the only guy in the plant who had touched his heart and lungs with his own hands. They were apparently successful poking the pieces back together, because he was back at work a few months later.
Some people have a strong will to live, if you keep your head and don't panic you can survive about anything.
(On a less tragic note, Dad once had an lady working for him who was rather, uh, large, with breasts of proportionately large size - HUGE tracts of land. She also had very long and pretty hair that was supposed to be in a hair net. One day she did not wear the hair net and got a bit too close to a piece of machinery with a rotating shaft and it grabbed her hair and wound it up, as she got closer it grabbed her shirt and promptly rolled up her breasts too before she could hit the emergency "OFF" button. She did get it turned off in time (lucky for her

) but was trapped with both breasts and hair horribly wrapped up on the shaft. Dad and a coworker had to cut her loose with a pocketknife. The lady apparently was howling like a Comanche warrior the entire time, this being a most painful and prolonged ordeal, they all said the volume and pitch were incredible. Amazingly, other than being bruised black and blue and losing a lot of hair, she was fine. Apparently became a very, very, very strong devotee of hair nets too. Perfect example of the "breast in a wringer" cliche that you used to hear)