The moment I saw it I recognized it as from the sinking of J/U rig “West Gamma” off Denmark in 1990:
I used to do rigmoves on this rig when she was Dyvi Gamma, working in Gabon and Angola in 1980-81.
The OIM on the rig then and when she sunk got a medal for the way he handled the situation and organized his crew for the rescue.
PS> On Norwegian registered offshore rigs the OIM has to be a Master Mariner (with some extra training), even on nonpropelled rig of any type.