Modern warships cargo and container ships are the cutting edge of maritime technology. But 2500 years ago no one dominated shipbuilding like the Greeks. We travel to Greece for a firsthand look at how their maritime expertise evolved. We examine a reproduction of the Greek warship called a trireme. A 3-D CGI reproduction captures the grandeur of the gigantic cargo ship the Syracusia. Host Michael Guillen demonstrates an Archimedean Screw-designed to pump water out of a ship's hold. He also demonstrates Archimedes' most famous discovery: The principle of buoyancy a key component in any shipbuilding process. In England we investigate the Antikythera device. After decades of study historians have concluded that it was actually a celestial computer that tracked the movement of the Sun Moon Mars Venus Mercury and a handful of stars. And on the Greek island Kalymnos we learn how sponge diving evolved into the lucrative business of salvage diving.