My friend's old man rolled his little tractor on the edge of a dam, he was slashing at the time. Any way we were swimming in the dam, his dad got pinned under the front wheel and my mate swam over in 2 seconds flat and pulled his dad out by dragging him through the mud under the wheel. Dislocated his arm, but saved his old man. When we towed the tractor out later that day you could see the drag line through the mud under where the wheel was. It was about half a meter deep and his dad said it felt like super man grabbed him and dragged him out, was pretty amazing stuff considering the mud wasn't real soft, we could walk on it and only sink down up to the ankle.