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19. Paul Allen’s Octopus
The late Paul Allen was a co-founder of Microsoft who went to the same high school as his best friend Bill Gates. He left the company due to health issues but eventually made a comeback after defeating his illness. His megayacht, the Octopus, comes with numerous gaming rooms, a helipad, a spa, a recording studio, and two submarines. Unfortunately, Paul succumbed to cancer in October of this year.