look up the term "auto rotation" Helicopters are unique as they can land with 0 engine power, provided they have enough elevation when the engine failure occurs and the piolot is skilled. being over water decreases the skill requirement. I will add that its bizzare people died and are in critical after what was a soft landing with doors off too. the "safety harnesses" are nothing but seat-belts you would find in a nascar or amusement park ride. no button. you just flip the front of the buckle forward and you are unlocked. It is strange.