However, he said the Swiss-based drilling company didn't identify any internal "management failures" that led to the disaster.

NPR: Claims Against BP Contractors Dismissed At Trial

Awema was wound up in February after a damning report by the Welsh government's own internal audit service exposed "significant and fundamental failures".

BBC: Awema: Opponents' urgent funding question for ministers

On Monday, the BBC announced that an internal investigation concluded the program's production was marked by a series of "unacceptable" failures.

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