The HMS Hellespont is a historic paddle steamer tug that sits perfectly upright in deep water. It's a beautiful and remarkably intact wreck, a favorite among technical divers exploring Valletta's Grand Harbour.

The HMS Hermes was the world's first purpose-built aircraft carrier. Sunk by Japanese bombers in 1942, she now lies off the coast of Batticaloa, Sri Lanka. This is an epic, challenging wreck dive for experienced technical divers.

The HMS Louis was a British destroyer that was sunk as an artificial reef. It's a very shallow and easy wreck dive, perfect for beginners, and has become a great habitat for a variety of Mediterranean marine life.

The HMS M2 was a unique submarine that was designed to carry and launch a small seaplane. The wreck sits upright with its hangar door open, making for a fascinating and historic technical wreck dive.

The HMS Maori was a British destroyer that was sunk in Valletta's Grand Harbour during WWII. The forward section of the wreck now rests in very shallow water, making for a fascinating and very easy historical shore dive.

The HMS Olympus was a British submarine that sank after hitting a mine in WWII. The massive, 86-meter-long wreck sits upright and is remarkably intact, making it a world-class technical wreck dive.

The HMS Pylades was one of the British naval ships used to guard the scuttled German fleet at Scapa Flow. It's now a shallow and very easy wreck dive, perfect for a check-out dive or for less experienced divers.

The HMS Russell was a pre-dreadnought battleship that sank after hitting mines in WWI. This colossal wreck is one of the ultimate prizes for very deep, expedition-level technical divers, a magnificent piece of naval history.

The HMS Stubborn is a WWII S-Class submarine that was scuttled after the war. It sits perfectly upright and completely intact in very deep water, making it a world-class technical wreck dive for qualified trimix divers.

The RMS Rhone is one of the most famous and beloved wreck dives in the Caribbean. This 19th-century mail steamer, featured in the movie 'The Deep', is broken into two sections, offering a spectacular and easy dive for all levels.

The HMS Victoria is one of the most unique shipwrecks in the world. This Victorian-era battleship sank after a collision and now rests vertically, with its bow buried in the seabed and its stern rising to 75m. An ultimate dive for expedition-level technical divers.

Hole in the Wall is a spectacular wall dive off the coast of Andros, featuring a large swim-through that cuts through a buttress on the main wall. The wall is covered in huge, colorful sponges and is a great spot to see pelagic fish.

Hood Canal is a long, fjord-like arm of Puget Sound. It offers spectacular wall diving, and is famous for its large population of wolf eels. In the winter, it's one of the few places in the world where divers can encounter the prehistoric sixgill shark.

The Imperial Eagle was a former ferry between Malta and Gozo. The large wreck now sits upright near an underwater statue of Christ. It's a fantastic deep dive for technical divers, with a beautiful reef wall nearby.

The Imperial Eagle was a former ferry between Malta and Gozo. The large wreck now sits upright near an underwater statue of Christ. It's a fantastic deep dive for technical divers, with a beautiful reef wall nearby.

The Inland Sea dive begins in a landlocked lagoon connected to the sea by a spectacular 80-meter-long tunnel. Swimming through the dark tunnel towards the brilliant blue of the open sea is an unforgettable experience.

The Invisibles are a series of low-profile coral heads on a vast sandy plain. The site is an oasis for marine life in the southern part of the island and is known for its high density of fish and frequent eagle ray sightings.

Ishigaki is one of Japan's premier dive destinations, famous for its manta ray cleaning station at Kabira Bay, often called 'Manta Scramble'. It's one of the most reliable places in the world to see manta rays.

Isla Carmen is the largest island in the Loreto park and offers a huge variety of dive sites. Divers can explore beautiful walls, shallow coral gardens, and submerged pinnacles, all with very healthy coral and fish life.

Coronado is a beautiful volcanic island in the Loreto Marine Park. It's home to a colony of playful sea lions, and the surrounding lava rock reefs are very healthy and covered in sea fans.

Isla Danzante offers some of the most popular diving in Loreto. The submerged pinnacles and rocky reefs are a magnet for schooling fish, but are also fantastic for macro life, with many different species of nudibranchs to be found.

Often called the 'Poor Man's Galapagos', Isla de la Plata is one of the best places in the world to see giant oceanic manta rays. During the season, dozens of these massive animals congregate here. Humpback whales are also a common sight.

Isla Grosa is a small island and marine reserve that offers beautiful and easy diving. The shallow reefs are home to a healthy population of groupers and a wide variety of other Mediterranean marine life.