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The committee investigating the accident concluded that it was caused by human error on the part of the dive tender who opened the clamp.
It is not clear whether the tender who opened the clamp before the trunk was depressurized did so by order of his supervisor, on his own initiative, or because of miscommunication.
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).
At the time, the only communication the tenders on the outside of the chamber system had was through a bullhorn attached to the wall surface; with heavy noise from the rig and sea, it was hard to listen in on what was going on.
Fatigue from many hard hours of work also took its toll among the divers, who often worked 16-hour shifts.
Olsen Energy subsidiary, and in 2009 contracted by BP for drilling in the United Kingdom section of the North Sea for three years.
Prior to the accident, Norske Veritas had issued the following rule for certification: "Connecting mechanisms between bell and chambers are to be so arranged that they cannot be operated when the trunk is pressurized," therefore requiring such systems to have fail-safe seals and interlocking mechanisms.