Saudi Prince's $450 million superyacht hides a secret cabin deep inside the hull, designed to...

Saudi Crown Prince Mohammed bin Salman Al Saud’s 439-foot Serene one of the most fascinating bedrooms sits three decks below the owner’s suite. 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.Located near the exact centre of the 439-foot yacht, a secret Balinese-inspired "sea cabin" was specially designed to reduce seasickness and provide a peaceful place to sleep during rough sea journeys.While many billionaire yacht owners place their master bedrooms high up for the best views, Serene has a two-master layout based on how ships move. Reports have long linked the Crown Prince to seasickness during long trips across the Mediterranean and open oceans. Instead of relying only on the yacht's powerful stabilisers, the designers used the science of ship movement to create a calmer sleeping space when the sea becomes rough.Using naval design to reduce motionThe sea cabin is located on the sta...