Stake a claim on the last unknown frontier: It lies just beneath our feet. The wonders of scuba diving in caves.

Dive Tribe founder Gwyn Mills agging sharks, placing mooring balls and sinking artificial reefs in his beloved Thailand keeps our May 2013 Sea Hero busy.

Peter Hughes knows a thing or two about live-aboards, and he has a spot in the DEMA Hall of Fame to prove it. In 2011, Hughes received the DEMA Reaching Out Award for helping to evolve the live-aboard diving industry over the past three decades. That same year, after spending more than 25 years building his former live-aboard company, Peter Hughes Diving, Inc., the 40-year scuba diving veteran threw all of his expertise and energy into a new live-aboard venture, the DivEncounters Alliance

From the reef to the open ocean, some marine animals have found ways to ease the daily rigors of survival in the underwater world by joining forces. Symbiotic and commensal relationships sometimes create mutually beneficial relationships for wildly dissimilar creatures — much to the entertainment of divers.

When I first told my family that I would be feeding sharks, everyone, especially my mom, thought I was crazy. In Fiji, some believe in a shark god named Dakuwaqa, so they respect the sharks. But growing up here, we mostly heard about sharks as man-eaters, and something to avoid. We certainly didn’t think of them as something you would want surrounding you, but that’s what happens to me every week.

There’s no better way to spice up a dive destination than by adding a wreck. We’ve compiled a guide to our favorite purpose-sunk wreck dives.

Every dive can be a magical mystery tour, but never more so than when you find yourself in a true secret spot.

Based on the opinions of thousands of divers from across the globe, our annual Top 100 Readers Choice Awards showcase the best scuba diving in the world.

Wreck diving in Palau’s iron ruins of World War II opens a window on the day their doomed sailors gave their all.