Assertion: explorer yacht | /r/HasProperty | octopus
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text: Famous hyper-rich mariners include late tech magnate Paul Allen, whose 414-foot expedition yacht, Octopus, doubles as a research vessel; Sheikh Khalifa bin Zayed Al-Nahyan, president of the United Arab Emirates, whose 590-foot Azzam currently holds the title of the world's longest private vessel; and Russian oligarch Roman Abramovich, who owns not one but an entire fleet of mega yachts worth a combined total of well over $1.5 billion.