The FLIP has easily withstood waves of up to 80 feet during its more that 300 missions.
With just over 300 ships in the fleet, LNG carriers still represent only a fraction of the more than 4200 oil tankers currently traveling the world's oceans.
In one week on the Liberty of the Seas the ships crew prepares over 100,000 meals and 90,000 desserts.
The U.S. Navy is the largest in the world, with a fleet tonnage greater than the next 17 largest navies combined.
Narrator: They're the cities of the sea and the power players of the ports. Some know how to water ski while others look right out of science fiction. A few carry enough frigid energy to heat 30,000 homes, for a year. Some are as sophisticated as they are practical and one will even flip you out. Now, Super Ships, on Modern Marvels.