It was later determined that the cargo door detached, which caused an explosive decompression; this caused the floor just above to collapse. The collapsed floor severed the control cables, which left the pilots without control of the elevators, the rudder and No. 2 engine.[16] The plane entered a steep dive and crashed. It was the deadliest plane crash of all time until the Tenerife disaster in 1977.[2] It is currently the deadliest single-aircraft crash with no survivors.