The idea of a superyacht that pampers guests with luxury both atop and below the waterline is one that has long tickled the imaginations of everyone from adventurous children to demanding billionaires. But it’s ultimately proven better-suited to the pens of fanciful designers than the realities of the marina. With the Nautilus, U-Boat Worx seems determined to bring the concept to reality.

It puts its considerable experience in personal submarine design into the impressive 123-ft (37.5-m) vessel, which combines the usual trappings of superyacht life – sundeck, pool, bar and more – with the unique abilities to dive down to 650-ft (~200-m) depths and stay underwater for days at a time.

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We always imagined the personal submarine market to be a rather leisurely one, filled with extended testing and development periods submerged in glassy-blue tropical waters. But U-Boat Worx has been absolutely grinding lately. Along with navigating a busy late summer schedule of major yachting events, it’s found the time to ramp up personal submarine production and drop prices to record lows. Now it introduces something entirely distinct from its usual lineup of submarines that can be launched via superyacht — a superyacht that works as a submarine in and of itself.

Read more: New Atlas