I assumed it was an MR3, my mistake. My neighbour used to pilot Shackletons and had several hairy moments when the Vipers failed on take off; apparently they were run on petrol which gave the fuel pumps a hard time. He also told me of about flying with live nuclear depth bombs during the Cuban missile crisis.:shocked:
I assume it was these: http://en.wikipedia.org/wiki/Mk_101_Lulu
'The weapon lacked any speed sensors to detect free fall from an aircraft, i.e., intentional dropping in flight, so if the weapon accidentally fell off an aircraft parked on a flight deck and rolled overboard it could detonate when it sank to the preset depth' !!