World's Biggest Shipbuilders | Thursdays 10/9c on Science Channel Full Episodes Streaming FREE on Science GO: https://www.sciencechannelgo.com/worlds-biggest-shipbuilders/ It takes weeks to cast, buff, and finish the 23-foot precision-designed propeller, made from an alloy of 8 metals. More Shipbuilding! http://www.sciencechannel.com/tv-shows/worlds-biggest-shipbuilders/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Facebook: https://www.facebook.com/ScienceChannel Twitter: https://twitter.com/ScienceChannel