from HybridAirVehicles facebook page:
Today there was an incident with the Airlander aircraft at Cardington airfield. The aircraft was not flying at the time of the incident. Our initial assessment is that the aircraft broke free from its mooring mast for reasons that will be investigated. The aircraft has a safety system which operates automatically in circumstances of the aircraft breaking free of its mast, and is designed to rip open the hull and deflate the aircraft. This is a safety feature to ensure our aircraft minimises any potential damage to its surroundings in these circumstances. The aircraft is now deflated and secure on the edge of the airfield. The fuel and helium inside the Airlander have been made safe.