Set sail on the world's mightiest ships as they embark on some of the most challenging, dangerous jobs a working boat will ever face. These marvels of marine technology are built for anything the heavens and oceans can dole out, and the dedicated men and women who work aboard these ships are equally battle-tested. From a state-of-the-art fishing vessel to an extreme Arctic and Antarctic cruise liner to the largest floating hospital on the planet, we give you a first-class, firsthand look at life aboard these remarkable ships.