The Roll-On/Roll-Off (Ro-Ro) ship North Star is one of the only links between Alaska and the continental U.S. So far this winter, her captain, Richard Cadigan, has delivered everything from food to building supplies to pickup trucks from Seattle to Anchorage on time - within a short 72-hour window.

The U.S. Navy's newest ship, a guided missile destroyer, goes through testing with its crew in preparation for deployment.

The Norwegian Epic is a billion-dollar showboat with more than 20 bars and restaurants and pool decks that transform into nightclubs.

Umiak I is the world's most powerful ice-breaking carrier, hauling mining equipment from Quebec City to Labrador and returning with nickel concentrate.

Le Boreal is as sleek and nimble as a yacht, with the luxurious appointments and service of a cruise ship. She's also tough - custom-crafted to take on the furious weather and towering waves of the Southern Ocean

The FPSO Maersk Peregrino is the world's biggest oil production ship and is permanently hooked up at the Peregrino oil field.