Cold-water diving in Alaska's Kenai Fjords National Park may be the best drysuit dive you've ever done.

Ever wondered if you can scuba dive at Yellowstone National Park? You can! Here's what it's like, and how to make the dive happen.

Ready to test your tec-diving skills? These shipwrecks from around the world are as advanced as it gets, but exploring their hidden treasures is an experience like no other.

At night, the wondrous creatures that hide during the day come alive from sharks and octopuses to ghostly glowing plankton.

Lake Mead, Nevada, is home to the B-29 Superfortress airplane wreck, along with a smorgasbord of some of the best underwater offerings in the world.

Kona's famed Manta Night Dive is the mother of all night dives. Watch as manta swoop out of the dark and in between scuba divers.

It's voluntourism on a cruise ship: Find out how to swim with manta rays and whale sharks in the Maldives aboard the Four Seasons Explorer liveaboard dive boat.

Dreaming of a Marquesas Islands getaway? Dive on the liveaboard *Itemata*, a 60-foot catamaran with exciting excursions and private dives.

Tofu is one of the few places on Earth where you can scuba dive with ocean-going and reef manta rays, and it offers the experience of a lifetime.