S1, E5: Around 1580, William Bourne of England published a book entitled “Inventions or Devises,” in which he outlined his idea for a ship that “may go under the water unto the bottom, and so to come up again at your pleasure.” The design featured oars, a snorkel, and a revolutionary concept…a submergible sea vessel. If successful, this would be the world’s first working design for a submarine. But how will Bourne’s blueprint fare in the blue sea? Matt and Jeremy are eager to find out, but they may literally have to hold their breath for the results.