Welcome back to the our channel for a discussion about how massive nuclear submarines and other military vessels make their way from the shipbuilder to the sea. I went on a retired submarine docked in the water at a Naval Base in Groton, Connecticut - no charge and it is a great experience, you walk down into the sub and walk from front to back - i highly recommend it if you are ever in that area! Actually the first combat submarines date back to the American Revolutionary War. With the Turtle famously being the first used to attack another ship. (it failed). WW1 saw the first widespread and effective use of true ocean going submarines as weapons. That was the Humlee ( I think that's correct) and was powered by hand cranking from its interior and could only sink to water level but could not dive. It leaked some too. It has been salvaged And is now a museum piece. The first American submarine used in wartime was 'The Turtle' used in the Revolutionary War. it was unsuccessful. The Case Hunley was used in the Civil War. The first modern U.S. submarine was the USS Holland.