Octopus, Microsoft co-founder Paul Allen's private yacht // Octopus, Microsoft co-founder Paul Allen's private yacht (Rex)

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Octopus, Microsoft co-founder Paul Allen's private yacht

This $200m (£120m) superyacht, owned by the Microsoft co-founder Paul Allen, is called Octopus - but given the range of James Bond-style gizmos on board, she perhaps ought to be known as Octopussy. She has two seemingly obligatory helipads, one on the bow and one on the aft deck, and a hangar for both choppers. There's a 10-man yellow submarine that can spend a fortnight underwater (no songs, please). Side hatches open to allow jet skis to launch, and, of course, there's a pool and spa to relax in as the sun goes down. To accommodate all these pricey amenities, the vessel is 126 metres long - making the list of the top 10 largest yachts.

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