It’s a yacht, it’s a submarine, it’s the Migaloo Submersible Yacht? For billionaires who demand the ultimate in adventure, add this luxurious craft to your shortlist. Available in five different models from the 72m M2 to a giant 283m M7, each craft features military-grade safety technologies, and use modern acrylic pressure hull for a wide-open interior space. Inside, guests are treated to amazing aquatic views, while a pool deck up top enables one to bathe in the sun when surfaced. Click here for the first image in this week’s funny work pictures gallery. Continue reading for a viral video of a real perpetual motion machine.