The world's super-rich spend $22 billion on yachts every year, according to UBS and Wealth-X's annual World Ultra Wealth Report for 2014. A yacht is the pinnacle of luxury and decadence.

At 728 feet long, it was billed as the world's largest yacht, a ‘floating millionaire’s row' offering residents access to an 'onboard beach' and a 10,000-bottle wine cellar. Five years on ...

Joyrides on jetskis while sailing the high seas on your giant yacht are so last year. Now, the world's .01% are seeking submersible vessels to accessorize their latest superyacht purchase ...