Meanwhile, Morriston hospital said on Monday evening its accident and emergency staff were "exceptionally busy" because of the incident, and appealed for people not to attend unless they had a genuine emergency.

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The incident has been reported to the Air Accident Investigation Branch and will also be reported to the Civilian Aviation Authority.

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Neither pilot reported having had an accident, incident or violation, neither had any ongoing medical conditions, and neither said he was tired, the report said.

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There were no injuries and little release of radiation from that incident, which remains the worst commercial nuclear accident in U.S. history.

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The FAA and NTSB are investigating all aspects of the accident, in an attempt to determine what ultimately caused the incident.

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"At the time of the accident, the Deepwater Horizon and its crew had compiled seven consecutive years of operations without a single lost-time safety incident, " the company said in a written statement.

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The defense argued that the incident was a tragic accident caused partly by the fact that the plane's altimeter was not working and the gondola cable that the plane hit was not on the map that he was given.

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