View of arming vane of bomb; once the bomb is dropped, the arming wire stays on the plane, pulls away from the bomb's propellor, thus allows the bomb's propellor to turn, which in turn arms the bomb's fuse so that when it hits target, the fuse sets off another charge, intermediary charge, which then sets off the main filling in the bomb. Filling, was high explosive (HE). HE inactive after so many years in the water. Starboard wheel on left.