Harmony of the Seas is as tall as London's Tower Bridge and as wide as a soccer. It required 50 thousand tons of steel to build!
These specialized ships help create paths by pushing into ice pockets.
Modern submarines can dive up to 240 meters underwater. When the crew is ready to submerge, external tanks that are normally filled with air, open to receive water. This makes the ship slightly negatively buoyant.
Liberty ships carried vital supplies across the Atlantic to Europe during World War 2, but Germans destroyed them in mass.
The new Littoral Combat Ships use a trimaran design for greater speed, agility, and stability.
Instead of a propeller and a rudder, LCS ships use high-powered water jets for propulsion and maneuvering.