I know of two persons that have been respectively killed in one case and severely injured (paralized) in another. Both cases were in Puerto Vallarta. One man was stabbed through the heart by rebar as he accidently landed in a cement block building under construction. The other landed on a ledge on the 9th floor of the Condominios Vista del Sol, dangled for a while by the ropes and then was inadvertantly pulled off the building by the boat and he fell nine stories to the ground below. These tragedies are probably rare, but you won't find me wanting to try, and I don't think I would be shopping for the cheapest bidder.