Byford Dolphin Diving Accident Fatalities

On November 5, 1983, a catastrophic accident occurred on the Byford Dolphin semi-submersible oil drilling rig in the North Sea, resulting in the deaths of five out of six divers and severe injuries to the sole survivor, Martin Saunders. The incident happened during a routine deep-sea diving mission at a depth of 295 feet. Divers Truls Hellevik and Bjørn Giæver Bergersen, assisted by dive tenders William Crammond and Martin Saunders, were returning to their highly pressurized sleeping chambers via a diving bell. A critical human error by an external diver led to the premature unlatching of the diving bell before complete depressurization, causing the internal crew chambers to instantly plummet from nine atmospheres to one atmosphere. This rapid decompression resulted in the immediate deaths of Roy P. Lucas, Edwin Arthur Coward, and Bjørn Giæver Bergersen, whose blood nitrogen turned into bubbles. William Crammond was killed instantly when the diving bell was violently propelled. Truls Hellevik suffered a particularly gruesome death, being pulled through a narrow gap, which expelled his organs. Martin Saunders sustained life-threatening injuries. The accident was also attributed to the Byford Dolphin's antiquated 1975 diving system, which lacked crucial safety features like fail-safe hatches and an interlocking mechanism. The Byford Dolphin continued operations until its decommissioning in 2019 and subsequent demolition.