Byford Dolphin has a length of 108.2 metres (355 ft), breadth of 67.4 metres (221 ft) and depth of 36.6 metres (120 ft).It has a maximum drilling depth of 6,100 metres (20,000 ft), and it could operate at a water depth of 460 metres (1,500 ft).The fourth diver was dismembered and mutilated by the blast forcing him out through the partially blocked doorway and would have died instantly.Coward, Lucas, and Bergersen were exposed to the effects of explosive decompression and died in the positions indicated by the diagram.
One month after the accident, Norske Veritas and the Norwegian oil directorate made the rule final for all bell systems.
The tender who opened the clamp was killed while the other was severely injured.
Medical investigations were carried out on the four divers' remains.
This incident was also attributed to engineering failure.
The obsolete Byford Dolphin diving system, dating from 1975, was not equipped with fail-safe hatches, outboard pressure gauges, and an interlocking mechanism, which would have prevented the trunk from being opened while the system was under pressure.