Cocos Island Aggressor

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The brand new custom built dive yacht launches her maiden voyage January 14, 2023.  She offers 10 night itineraries to Cocos Island, a lush green tropical island located 342 miles off of Costa Rica’s Pacific coast. Rocky pinnacles surrounding Cocos Island are beacons for schooling hammerheads, countless white tip sharks, mantas, frog fish and tuna.

Cocos Island National Park was designated a World Heritage site by UNESCO in 1997. The ten-night trips offer seven days of Costa Rica liveaboard scuba diving. The COCOS ISLAND AGGRESSOR® departs from the port town of Puntarenas.

We think…

If you love diving with large pelagic marine life, diving Cocos Island is one of the best dive locations in the world. Cocos Island Aggressor is a comfortable choice for visiting this region. The destination is not suitable for beginners.

Cocos Island Aggressor liveaboard departs from Puntarenas on the west coast of Costa Rica, reached by car from the capital San Jose in about three hours.

The crossing to Cocos Island takes about 32-25 hours. Because of the long journey, extended 10-night excursions are offered, with 7 full dive days, making the trip worthwhile. All divers must arrive in San Jose at least one day ahead of cruise start. It is also recommended to have one night after cruise end. Pick-ups are done only from four host hotels in San Jose.

Cocos Island, Provincia Puntarenas, Costa Rica

San José, Provincia San José, Costa Rica

Puntarenas, Provincia Puntarenas, Costa Rica

The Cocos Island Aggressor is a brand new custom built dive yacht whose maiden voyage is January 14, 2023. 

She is a 124’ yacht, built and powered for comfort, safety and stability. She is diesel powered, cruises at 10 knots and has 110-volt power on board. Comfortable accommodations for 22 guests includes 4 master staterooms located on the upper deck and and 7 deluxe staterooms with side by side twin beds located on the lower deck. Each stateroom features a private bathroom and shower, individual climate control, and a monitor with a media player.

The Cocos Island Aggressor has a spacious salon, large sun deck, chaise lounges, deck chairs, bar, and grill. There is ample storage space for your diving equipment in your personal locker. The yacht provide 80 cubic ft. tanks, weight belts and weights. All tanks have K-valves (American type) and DIN (European) valves.

There is a variety of nightly entertainment, including diving, fish identification presentations, movies, games and more. If you have a favorite movie or digital presentation to share, we encourage you to bring it along. The staff especially loves new releases of movies, recent magazines and books. A small library of books for exchange is maintained onboard as well as fish identification books for reference.

Master Stateroom

All Master Staterooms have a large picture window, private bathrooms and showers, individual climate control, monitor with media player and hair dryer. Stateroom #10 has a queen bed (Couples only), #’s 8, 9 & 11 have two twins.

8 cocos island aggressor liveaboard cocos island costa rica master cabin

Deluxe Stateroom

All Deluxe Staterooms have two single beds, 2 port holes, private bathrooms and showers, individual climate control, monitor with media player and hair dryer.

9 cocos island aggressor liveaboard cocos island costa rica twin cabin


The dive deck has plenty of space for 22 divers. Each passenger has their own tank rack, locker and bench and the dive deck is well equipped for photographers’ needs, with rinse tanks, charging stations and a three-tier camera table with low pressure air hoses. Rental dive gear is available at extra cost.

The dive platform located at water level is rarely used for diving but is ideal to get into the water for snorkelling. All diving is done from two dive tenders and divers are split into smaller groups that dive different sites.

Dive Sites

Cocos Island is one of the few remaining dive locations where you can still expect to see large pelagic marine life. The island is essentially a huge mountain starting thousands of metres below the surface and breaking the surface as an impressive Island with steep cliffs and little island groups.

The biggest attractions are huge schools of hammerhead sharks. Most dives are done close to surrounding rocks and islands. The cleaning stations in these areas attract schools of hammerhead sharks. On almost every dive you will encounter huge schools of fish, mostly Jacks and barracudas and large fish such as silky, silver lace and grey-sharks, mantas and mobula rays. Whale sharks and dolphins are not uncommon and can be spotted on almost all routes. Turtles, moray eels and lobsters are everywhere. With a little luck, you may encounter chasing sailfish or whales.

Okeanos Aggressor 1 liveaboard takes divers to Cocos Island in Costa Rica, one of the best places in the world for diving with hammerhead sharks and other pelagic marine life.

Staying Connected

Email is available onboard through the satellite system. There is a charge for incoming and outgoing email. Private calls may be made from the yacht. When diving at Cocos Island, there is a cell tower with intermittent reception.

Cocos Top Dive Sites


A 600’ long submerged mountain, the top of the mountain is 75’ from the surface. Schooling Hammerheads, Mantas and schooling fish. Possible Sailfish or Marlin.

Big Dos Amigos

This islet features a 45-foot-high arch and 60-foot pinnacle off the southeast side. Look for Rainbow Runners, Yellowtail Snapper, Bigeye Jacks and lobster. Hammerheads swim between the pinnacle and arch.

Bird Island, Chatham Bay

Dove from Chatham Bay, southeast of Manuelita, this site provides a variety of marine life including Frog Fish, lobsters, morays, rays, White Tip Sharks and Hammerheads. There is even a cleaning station.

Dirty Rock

A large island with schools of Marble Rays and Hammerheads.

Lone Stone

Schooling Marble Rays and Mobula Rays.


The northeast corner has asheer wall. Lots of White Tips, Marble Rays and schools of Creoles.

Special Sightings

Whale Sharks, mating Eagle Rays, Sail Fish, mating White Tip Sharks, False Killer Whales.

Ubing Rock, Wafer Bay

This 300’ rock begins at 20’ and drops to a 110’ sandy bottom. The southeast slope attracts schooling Hammerheads.

Trip dates & availability

Please see pricing table below the availability panel for inclusions, exclusions, and extras.

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