I don't know the answer, but it reminds of the one I saw moored in Palma, Majorca when Mrs Fester and I were there in 2006.
Apart from the one we saw was so large that it had TWO separate heli-pads on deck, plus at the rear of the vessel it had a smaller 'yacht' built in to the boat, which was still bigger than my house, and could uncouple and set off on cruises on its own!
Security was tight when I approached the quayside to get a closer look, and it was rumoured to belong to Roman Abromovich, the owner Chelsea FC.