"Octopus" is believed to be the fourth largest yacht in the world only behind the ... club with M/Y Pelorus and M/Y Le Grand Bleu. Paul Allen who is rated the third richest US citizen and seventh ...

With an estimated net worth of $17.5 billion, Microsoft cofounder Paul Allen can afford some expensive toys. His 414-foot yacht, "Octopus," has to be one of the best billionaire toys around.

Tatoosh, a 300-foot yacht owned by billionaire Microsoft co-founder Paul Allen, allegedly did some serious damage to a coral reef in the Cayman Islands, according to the Cayman News Service.