Last Thursday a lawn maintenance company here was mowing a residential account that had a small pond with a high dam bank on one side. As one of the workers was mowing the bank with a Chariot Jr. it began to slide down towards the water. Before the employee (18 yrs old) could jump off the mower turned over on him and drove both into the water. His head was submerged and he could not get up because the mower was on top of him. Fortunately, another worker was weedeating nearby and saw what happened. He was able to hold the guys head above water til help came to lift the mower off. The employee suffered two broken legs. I saw the mower at the dealer, it was not damaged other than a bent seat and lots of mud.