This "Migaloo" super-yact is decked out with all the amenities you could ever possibly want on vacation, including a few decks, a grand staircase and even elevators. Oh and it's submersible too, which makes it more of a submarine with yacht-like features. So if this giant luxury watercraft is a tad indiscreet cruising the open seas, you can submerge and hang out underwater. Ah, if only — this submersible is only a concept.

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