Cocos Island Aggressor — a modern, dive-first yacht for a remote liveaboard

Cocos Island is the reason to choose this boat: a remote Costa Rican destination reached on an 11-day, 10-night liveaboard rather than a quick resort transfer. The Cocos Island Aggressor suits divers who want the trip built around repeated access to the water, not a yacht that merely happens to carry scuba gear. It is a recent vessel, purpose-designed for diving, with shaded working space, personal lockers and tenders for the route. The published highlights point to hammerhead sharks, eagle rays and whales, but there are no verified site notes here to turn those possibilities into promises. Choose it for the remoteness, the long time at sea and a boat that makes the diving program its central job.

The Cocos Island Aggressor makes a clean, modern first impression. Built in 2022, it has the feel of a yacht designed around long dive charters rather than converted for them: the dive area is shaded, equipment has personal storage, and the route is supported by a proper platform and diver tenders. Inside, the air-conditioned salon gives the boat a place to retreat from heat, spray and the constant business of gearing up. Outside, a terrace offers the opposite—open air and room to look out toward an island that is far from the mainland. There is no old-hull romance to sell here. The appeal is practical: a newer boat, a clear diving purpose and enough shared space for a full group without pretending the vessel is a private yacht.

The atmosphere is shaped less by luxury claims than by the crew's part in keeping a remote dive trip moving. English is the working language, and the crew combines local and international staff. Passenger feedback puts the crew at 9.0, diving at 9.1 and food at 9.6, while the boat itself scores 7.9. That gap is worth reading plainly: the people and the operation leave the stronger impression than the hull as an object. Over several days, the crew briefs dives, keeps meals and drinks moving, helps with the diving logistics and supports guests in the water where the setup allows it. Evenings can include audio-video entertainment. The lasting character is a working dive team with a comfortable base, not a floating resort trying to distract from the reason everyone boarded.

Every dive begins with a comprehensive briefing from the dive staff. Groups dive as buddy teams of two or three; a staff member is not counted as a buddy unless the staff member and guest are the only people in the team. A staff member accompanies tender groups in the water to offer assistance and help keep the group together. Guests are not required to follow the staff member. The crew speaks English. Courses available on board include Advanced Open Water and Enriched Air Nitrox, with other specialties potentially offered after arrival. Safety equipment includes first-aid kits, fire alarms and extinguishers, life jackets, lifeboats, radar, GPS and VHF/DSC/SSB radio.

The dive setup starts with 80-cubic-foot tanks, weights and weight belts. Tanks accept both K valves and DIN valves, so divers using a DIN regulator do not need to rely on a limited supply of adapters. The boat provides personal lockers, shaded dive space, rinse tanks and a dive platform, with diver tenders supporting the route. Nitrox is available as an optional extra at 32% for certified Nitrox divers. Larger 100-cubic-foot or 15-litre tanks can be requested as optional rental equipment, subject to availability, and sidemount is accepted only with a single-tank configuration. Rebreathers, double tanks and underwater scooters are not supported. The arrangement is straightforward for conventional recreational gear and gives cameras and wet equipment a defined place to live between dives.

Between dives, the useful refuge is either the shaded dive area or the terrace. The air-conditioned interior salon offers a cooler, quieter place to sit, and the boat has audio and video entertainment for the hours when the sea is doing the work. Charging stations matter on a route where cameras and lights may be used repeatedly. There is no need to invent a program for the gaps: they are the time to rinse salt away, check equipment in the personal locker, eat, charge batteries and return to the deck when the next briefing begins. The boat's non-diving spaces support that cycle rather than competing with it.

The day follows a clear order: a dive briefing comes before the tender ride and entry, then recovery time, food and equipment checks before the next briefing begins the cycle again. The shaded dive area and personal lockers keep the practical work close to hand, while the salon and terrace give divers somewhere to sit between water sessions. Meals, snacks and drinks punctuate the day, with wine at dinner. Cocos Island diving is carried out from tenders, which take divers to the site and collect them after the dive. The sequence is simple: brief, ride out, dive, recover, eat, prepare, repeat.

The galley serves full-board meals combining Western and local cooking, with vegetarian and vegan options available. Non-alcoholic drinks, tea, iced tea, coffee and drinking water are provided, while beer is available and wine is served with dinner. Snacks fill the spaces between meals, which matters when the day is organized around diving rather than restaurant hours. The food score is the boat's strongest published result at 9.6, and that gives the galley real weight in the choice: on a remote route, a good meal is not decoration but part of how divers recover for the next entry. Welcome cocktails and dinner wine give the evening a different pace without turning the boat into a party vessel.

The cabin choice runs from Deluxe Cabins and Master Cabins in twin or double arrangements to a Solo Stateroom. Cabins are air-conditioned and have private bathrooms with hot-water showers, so the basic recovery after a dive does not depend on sharing a washroom. The Solo Stateroom is forward and has a porthole; that position gives it a more enclosed, shipboard feel than a cabin built around a large view. Personal space matters on a remote charter, especially when wet gear and camera equipment are part of daily life. The boat provides it in the useful places: private cabin facilities, individual climate control and lockers for diving equipment. The atmosphere is functional rather than decorative, with the salon and terrace carrying most of the communal life.

The Cocos Island Adventure departs from and returns to Puntarenas, Costa Rica. Hotel transfer is included. Boarding details vary by charter, so the departure information supplied for the booked trip is the one to follow.