On 11 May 1964, Vulcan B2 XH535 crashed during a low speed demonstration. The test pilot was demonstrating a very low speed and high rate of descent when the aircraft began to spin. The landing parachute was deployed and the spin stopped briefly but the aircraft then began to spin again. At around 2,500 ft (760 m) the aircraft commander instructed the crew to abandon the aircraft. The aircraft commander and co-pilot ejected successfully but none of the crew in the rear compartment did so, presumably due to the g forces in the spin.