Closer to Costa Rica’s Pacific Coast is Isla del Caño, which nestles off the Osa Peninsula and is one of the most biodiverse places on earth. It’s home to large schools of tropical fish, sea turtles, whale sharks and the occasional hammerhead shark that frequent its stunning coral reefs.

In the far north of Costa Rica is the picturesque province of Guanacaste where the Bat Islands are protected within a UNESCO World Heritage-listed conservation area. Dive with manta rays, sea turtles, sharks and a vast range of macro life, together with large pelagic such as humpback whales.

The Okeanos Aggressor I is a 110-foot, diesel-powered yacht that’s been designed for stability and comfort, with a cruising speed of 10 knots. It has the capacity for 22 guests in its 10 cabins, which include one quad cabin.

The Okeanos Aggressor II is a 120-foot, diesel-powered yacht that boasts 110-volt of power and can cruise at 10 knots. It has the capacity for 22 guests in its 11 cabins, which include two spacious suites.


There are 11 staterooms aboard the Okeanos Aggressor II, each of which features a private ensuite bathroom, mirrored cabinet and hairdryer.

There are two spacious suites (1 with a king bed and the other with 2 twin beds) on this luxury Costa Rica liveaboard. Both offer picture windows, a private minibar and a large bathroom with travertine floors.

Master Stateroom
There is one Master Stateroom that features a queen-size bed and a monitor with media player.

Deluxe Staterooms
There are eight Deluxe Staterooms that are fitted with a lower double bed and upper bunk-style bed.


The menus onboard the Okeanos Aggressor I and II are varied and plentiful, including American feasts, barbecues and local Costa Rican cuisine. Wake up to a breakfast of hot entrees, cereals, fruits and juices, followed by a buffet-style lunch served after the morning dives that may include hot soups, homemade bread, sandwiches and salads.

The chef-prepared dinners include beef, chicken and seafood and are accompanied by tasty vegetable dishes, salads and a freshly made dessert. Most special dietary requirements can be catered for with prior notification, however, the remote nature of the location means this is not always possible.

Fruit juices, soft drinks, iced water, tea and coffee are complimentary throughout your Costa Rica liveaboard vacation, together with a selection of local beers and wine. Due to the high duty charged on liquor, it’s suggested that you bring your own liquor while being reminded that drinking and diving do not mix.


Both the Okeanos Aggressor I and II feature a spacious salon and sun deck with covered and uncovered areas, as well as chaise lounges and deck chairs where you can relax between dives. Grab a drink and mingle with your fellow divers at the bar or enjoy the alfresco atmosphere during barbecue nights.

Onboard entertainment includes a range of board games and a small selection of DVDs, with guests invited to bring their own new releases to share with the crew and other guests. There’s also a small exchange library that’s well-equipped with fish identification books for your reference. There are are safes onboard both vessels where you can store your valuables such as cash, passports and credit cards.


Three to four dives are offered each day (night dives are currently not offered) on the Okeanos Aggressor I and II Costa Rica liveaboards, with all diving conducted from 22-foot pangas. Water temperatures average around 72-82°F (22-27°C) with cool thermoclines and most divers are comfortable in a 3-5mm wetsuit. The majority of the action takes place between 50-100 feet (15-30 meters) in depth, with visibility between 80-100 feet (24-30 meters).

Divers are invited to select a buddy of their choice or can dive with one of the highly skilled crew members. Detailed briefings are given at the start of each dive and a divemaster is available on each panga for every single dive. Guests should be aware that the diving is suited to those who have experienced due to its rugged nature and currents and the long journey to the island (up to 36 hours) may require precautions for motion sickness.

The Okeanos Aggressor yachts provide 80 cubic ft. tanks, weight belts and weights, with a full-line of Aqua Lung dive gear available for rent. Guests are provided with a GPS locator that operates through satellite in case of emergencies to help the rescue team locate your position.

A number of diving specialty courses are offered onboard, including Advanced Open Water, Under Water Photography and Nitrox, with Nitrox also available for certified divers at a surcharge.

The Okeanos Aggressor yachts are equipped with a complete digital photo facility that includes a PC for downloading photos. It features a strobe charging station and a large camera table for underwater photographers to work at. Photography equipment is available for rent onboard, together with free coaching from the liveaboard’s photo pro and the video professional is available to capture your dive adventure for an additional charge.