The Proteus is a yacht combined with a submarine, a boat that can dive underwater on a whim to give you a fish's-eye view of the murky depths. Built by submersibles-manufacturer Exomos, based out of the United Arab Emirates, the Proteus seats up to 16 people on deck and 8 inside the cabin, and divers are safe to sit on the deck while it submerges for the viewing pleasure of those inside. Fortunately for curious landlubbers, Exomus gives you not just a submersible yacht, but also extensive training along with your purchase. The expert training should ensure that you'll be adequately prepared to head to Davy Jones' Locker with nothing to fear.
Proteus: Fully-submersible Yacht, via Yanko Design