Here's a picture of one that crashed off Okinawa - *zero* fatalities, by the way - in 2016. This one went down after a mid air refueling accident where the refueling hose from the air tanker went into the rotor arc on one side and damaged the rotor, something that has taken down conventional Marine helicopters in the past. (For those that don't know, Marine and Navy aircraft generally use probe-and-drogue refueling, where the tanker trails an unguided fuel hose behind it in the sky and the pilot of the aircraft being refueled has to fly his aircraft's extended refueling probe into the socket on the end of the hose. Leaks are common. Having the hose hit the refueling aircraft is also not unheard of.
This video shows a not unrelated kind of accident with a CH-53 conventional helicopter. It also had to have an emergency landing and was only slightly less serious.)
Note the "broom straw" or "broom stranding" of the rotors - so they do actually do this in the real world, not just the laboratory - which is always a non-trivial concern when dealing with things that 'should' happen. :P In this case, the pilot managed to limp his crippled Osprey to just off the beach and ditched it in airplane mode. All five crew got off fine, only two suffered injuries.