Saudi Crown Prince Mohammed bin Salman's $450 million superyacht hides a secret sea cabin deep inside the hull, designed to reduce seasickness and ensure peaceful sleep during rough voyages

To escape the scorching summer heat of the Middle East, Saudi Crown Prince Mohammed bin Salman Al Saud equipped his $450 million superyacht Serene with a custom-built snow room cooled to minus 11 degrees Celsius. But despite the yacht's luxurious features, one of its most important design elements is hidden three decks below the main owner's suite.

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