Scuba diving Cocos Island

Scuba diving in a UNESCO World Heritage Site, Cocos Island offers divers exceptional marine life. Submerged volcanic islands covered with reefs set the backdrop for large schools of scalloped hammerhead sharks, mantas ray, marlin, whale sharks from May to August and humpback whale sightings all year-round.

The scuba diving in Cocos Island is nothing short of exceptional, with unparalleled shark experiences in a Pacific playground for schooling hammerheads, manta rays, whale sharks, endangered sea turtles, humpback whales, and so much more.

A UNESCO World Heritage site, the uninhabited Cocos Island, 550km (340 miles) west of the Pacific shore of Costa Rica, and halfway to the Galapagos Islands, offers divers unadulterated marine splendor. Liveaboard dive trips from mainland Costa Rica allow divers access to this remote, yet abundant, island brimming with diversity both above and below the ocean waves.

With a colourful history of pirates, whalers, Tongan captives and German adventurers, scuba diving at Cocos Island is now firmly on the world map as a top diving destination, filled with the promise of diving as many as 3 or 4 dives per day, exploring ocean pinnacles amid waters practically exploding with sea life.

On shore, the island is also crammed with species of plants and animals found nowhere else on earth. Insects and birds, including the famous Cocos Island Cuckoo, flit through the dense rainforest, only broken up by the many rivers and waterfalls that attracted so many passing sailors throughout history.

Cocos Island Diving FAQ

Things to know
  1. What marine life can I expect to see around Cocos Island?
  2. What are the best dive sites in Cocos Island?
  3. What's the best time to dive Cocos Island?
  4. What's the recommended experience level for diving Cocos Island?
  5. How do I get to Cocos Island?

What marine life can I expect to see around Cocos Island?

The reefs, submerged volcanic landscapes, and deep, nutrient-filled ocean waters around Cocos Island are home to over 300 species of fish (including more than 25 endemic species such as the striking, rosy-lipped batfish), corals, and crustaceans, but it's the astonishing volume of pelagic life that has made scuba diving in Cocos Island world famous.

May to November is the best time for diving with the huge schools of scalloped hammerhead sharks, while the biggest fish in the sea, the whale shark, only hang around from May to August, feeding off the local plankton.

Manta rays enjoy the waters for the other half of the year, from November to May, but, really, any time of year is good for checking out the huge populations of yellowfin tuna, marlin and sailfish

Throughout the year humpbacks, pilot whales and dolphins can be spotted passing through the region, as well as a variety of turtles, including hawksbill, green and olive ridley turtles.

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What are the best dive sites in Cocos Island?

Manuelita Coral Garden is often the first dive spot on Cocos Island trips. With generally calm ocean conditions, the garden ranges in depth from 6 to 21 meters (20 - 70 feet) filled with numerous tropical fish, lobsters, eels, as well as the big stuff such as black and white tip sharks, turtles, eagle rays, hammerheads, and even the occasional tiger shark. If that weren't impressive enough already, a night dive here boasts massive schools of white tip sharks weaving through coral formations in search of food.

For scuba diving with hundreds of scalloped hammerhead sharks, Bajo Alcyone cannot be beat. Positioning themselves at 25 meters (82 feet) atop a massive, undersea mountain, divers hang on amid the strong currents as they are practically swarmed by hammerheads, while enjoying visitors to the local cleaning station including mantas and mobula rays, and keeping their eyes open for passing free-swimming moray eels.

The huge natural arch at Dos Amigos Grande is a thing to behold and adds an adventurous and interesting aspect to your dive.

Consisting of rock pinnacles and volcanic boulders that break the surface of the Pacific, Dirty Rock is also one of the best dive sites in Cocos Island for checking out an unbelievable volume of schooling hammerheads sharks, as well as silkies, eagle rays, immense schools of jacks and the occasional whale shark.

Silverado is a wonderfully shallow dive site off Cocos Island where silver tip reef sharks seem to line up patiently for their turn at the local cleaning station on top of a two-meter-high pinnacle. Divers relax on the sandy bottom at 13 meters (40 feet) and watch the shark action unfold before them.

Off the southeast coast of Cocos Island, Submerged Rock, as its name implies, sits just below the surface, only visible from above at certain times, and presenting a well-known hazard for boats. This flat-topped pinnacle offer divers colourful scenery and a small, arched swim through abounding with a manner of tropical, tuna, hammerheads, mobula rays and often pregnant mother white tip sharks with their miniature offspring.

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What's the best time to dive Cocos Island?

The weather on Cocos Island is humid and tropical all year long, with plenty of rain showers to keep the island eternally lush and green, and temperatures on average around 33°C (92°F) during the summer months of May to November dropping to around 27°C (82°F) in the winter, or invierno. Although the island still has a wet and a dry season like mainland Costa Rica, it rains pretty much most days.

Water temperatures are fairly consistent throughout the year, only changing by a degree or two from summer to winter, staying in the range of 24-28°C (76-82°F). But because the island is basically out in the middle of the deep Pacific waters, temperatures can also vary from site to site and thermoclines are common, so many people diving in Cocos Island bring along a hood, gloves and booties to compliment their 3 to 5 mm long wetsuit.

Visibility at dive sites is best during the drier months of December through April (up to 25 meters / 85 feet), and currents generally at their gentlest, offering divers the chance to see an impressive array of marine species. But most divers opt for the more challenging ocean conditions and lower visibility encountered from May to November for their Cocos Island dive trip, as they're here to see the schools of hundreds of scalloped hammerhead sharks.

Along with these stars of the Cocos Island show, Whale Sharks are also in residence from May to August, while diving during the months of November to May increases the chance communing with Manta Rays. The New Year brings migratory humpback and pilot whales into the area.

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How do I get to Cocos Island?

The easiest and most comfortable way to scuba dive Cocos Island is from a Costa Rica liveaboard. The main airport serving international arrivals into Costa Rica is Juan Santamaria Airport (SJO), 17km (11 miles) northwest of the country's capital of San Jose, but quite a few Canadian and US airlines are now also flying into the norther airport in Liberia - Daniel Oduber Airport (LIR).

From either entry airport, it's about a 2 hour ride through the farmlands and plush native jungle to the port city of Puntarenas, the main jumping off point for scuba diving liveaboards in Cocos Island. Sailing from Puntarenas, liveaboards sail overnight 32-36 hours out to the spectacularly remote Cocos Island to discover the incredible wonders this unique dive area has to offer.

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