On a trip to circumnavigate Svalbard by sailboat, one diver finds extreme adventure—and temperatures.

A cave diver's paradise, the Bahamas is home to an extensive network of life-sustaining underwater caverns chock-full of history—and a whole lot of mystery.

When the temperatures dip, but the urge to dive hits, residents in South Carolina head to Lake Keowee, where an on-site energy plant warms the water to temperatures up to 80 degrees.

Sustainability can be subjective, which makes it tricky to book a truly eco-conscious getaway. This program makes it easier to identify operators who are making real differences.

Disneyland may the "Happiest Place on Earth," but one family found their joy in Fiji's deep blue, where the bright corals and stunning sharks were complemented by friendly locals.

After sea star wasting disease wiped out more than 90 percent of the ocean's wild sunflower sea star population, divers brave the cold Alaskan waters to find traces of the remaining population.

On a late-night dive in Sitka, Alaska, two divers encounter myriad fascinating creatures, including a giant Pacific octopus on the prowl.