A Superyacht Submarine Debuts in MonacoSpecial delivery: Sign up for the free Yachting email newsletter.At the Monaco Yacht Show, U-Boat Worx unveiled its Nautilus design, a 123-foot, 1,250-ton vessel that the company says can function as a yacht or a submersible that uses diesel-electric power down to about 650 feet below sea level.Cruising speed is projected to be 9 knots for the Nautilus, with an underwater speed of 4 knots.What’s the asking price to build the first Nautilus?Microsoft Store Offers - SponsoredThe Highest Paying Cash Back Card Is Finally Here NextAdvisorThis Stock Could Be Like Buying Amazon in 1997 The Motley FoolSavvy Americans are moving their money to these banks MSN MoneyThese are the best mortgage rates in your area MSN Money"