The Boiler Wreck, near Jeddah, is a historic steamship that is now very broken up. The most recognizable features are the ship's massive boilers, which have become a beautiful artificial reef, covered in coral and swarming with fish.

The Canyon is a classic Dahab dive site. It's a deep, narrow canyon that cuts into the reef bed. Divers can swim through the beautiful, enclosed canyon, which opens up into a large cavern known as the 'Fishbowl'.

The Canyon is a classic Dahab dive site. It's a deep, narrow canyon that cuts into the reef bed. Divers can swim through the beautiful, enclosed canyon, which opens up into a large cavern known as the 'Fishbowl'.

The Canyon is a classic Dahab dive site. It's a deep, narrow canyon that cuts into the reef bed. Divers can swim through the beautiful, enclosed canyon, which opens up into a large cavern known as the 'Fishbowl'.

Also known as Opunohu Canyons, this site has a beautiful underwater topography of sandy canyons that cut through the reef. It's one of the best places in Moorea to see large green sea turtles, and lemon sharks are often seen patrolling the area.

The Canyons is the signature advanced dive site of Puerto Galera. Strong currents sweep divers through three deep canyons that are teeming with life. It's an adrenaline-pumping drift dive with large schools of fish and beautiful soft corals.

The Cathedral is one of Mauritius' most famous dive sites. It's a large, beautiful cavern with a huge archway and several openings that allow sunlight to stream in, creating a spectacular, cathedral-like light show.

The Cathedral is a large, beautiful cavern dive near Port Vila. Divers descend down a chimney and enter a massive cavern with several exits to the outer reef. On sunny days, the light streaming through the openings creates a stunning, church-like effect.

The Cathedral is a large, beautiful cavern dive near Port Vila. Divers descend down a chimney and enter a massive cavern with several exits to the outer reef. On sunny days, the light streaming through the openings creates a stunning, church-like effect.

The Cathedral is another premier dive site in Belongas Bay, South Lombok. It's a massive pinnacle with several swim-throughs and canyons, creating a cathedral-like feeling underwater. It's a great spot to see mobula rays and other pelagics in the blue.

The Cathedral is one of Anilao's most famous dive sites. It features two large coral bommies with a small concrete cross placed between them. It's a very easy dive and a popular spot for fish feeding, attracting a swarm of friendly reef fish.

The Cauldron is an adrenaline-fueled drift dive through a channel between Gili Lawa Laut and Gili Lawa Darat. The highlight is 'The Shotgun,' where the current accelerates dramatically, launching divers over a beautiful coral garden, often alongside manta rays and sharks.

This is a unique dive site featuring a cave that connects the reef to an inland pool. The cave is believed by local custom ('kastom') to be home to a shark spirit, and it is a fascinating and atmospheric dive for experienced divers.

The Caves on the west coast of Nevis is a fun and easy dive exploring a series of interconnected caves, tunnels, and swim-throughs. It's a great spot to find resting turtles and lobsters, and is perfect for snorkelers too.

The Caves at Norman Island are rumored to be the inspiration for Robert Louis Stevenson's 'Treasure Island'. They are a series of three shallow, open sea caves that are fantastic for snorkelers and beginner divers to explore.

The Grotto at Bruce Peninsula National Park has underwater caves that can be explored. This shallow cavern system offers a fun and atmospheric dive, with beautiful light effects on sunny days. Perfect for snorkelers and beginner cavern divers.

The Caves at Norman Island are rumored to be the inspiration for Robert Louis Stevenson's 'Treasure Island'. They are a series of three shallow, open sea caves that are fantastic for snorkelers and beginner divers to explore.

The Caves at Kadavu is a fun and easy dive exploring a series of interconnected shallow caverns and swim-throughs. The entrances are large and open, and sunlight streams in, illuminating the colorful soft corals that decorate the walls.

The Champagne is a beautiful and easy wreck dive. It's a former passenger yacht that sits upright and has a distinctive bubble-shaped cockpit. The wreck is easy to penetrate and is now a thriving artificial reef.

The Chapel is a dive site named for a small chapel on the cliffs above. Underwater, it features a submerged pinnacle and a beautiful sloping reef that is a fantastic spot for macro life, including frogfish and many nudibranchs.

The Chikuzen is a large refrigeration ship that lies in a remote, sandy area. Its isolated location has made it a magnet for a huge amount of marine life, including massive goliath groupers, sharks, eagle rays, and huge schools of fish.

The Chimney at Great Dog Island is a fun and easy dive featuring a beautiful, coral-encrusted archway that forms a short swim-through. The surrounding reef is also very beautiful and full of life.

Located in the Namena Marine Reserve, The Chimney is a series of vertical swim-throughs that start on a pinnacle. Divers can ascend through the chimneys, which are covered in colorful soft corals and are often filled with schooling glassfish and anthias.