Cocos Island

Cocos Island is a remote, uninhabited island off Costa Rica’s Pacific coast — a UNESCO World Heritage site reachable only by a 32-36 hour liveaboard crossing. It’s one of the world’s premier big-animal dive destinations, famous for enormous schools of scalloped hammerhead sharks.

Best Time to Travel: Year-Round | Peak Hammerhead Season: June – November. Diving: Boat Diving, Advanced Currents. Unique Marine Life: Scalloped Hammerhead Sharks, Whitetip Reef Sharks, Silky Sharks, Whale Sharks, Marble Rays, Sea Turtles. Level: Advanced. Sea Temps: 78–82°F. Air Temps: 80–85°F. Accommodations: Liveaboard.

Cocos Island Aggressor

Cocos Island Aggressor runs one of the most famous big-animal itineraries in the world, cruising 36 hours offshore to a UNESCO World Heritage site known for massive schools of scalloped hammerheads. Expect strong currents, blue water, and regular encounters with whitetip reef sharks resting in the hundreds.

This is advanced, open-ocean diving — the reward is close encounters with an unusual concentration of pelagic life found almost nowhere else.

Okeanos Aggressor II

Okeanos Aggressor II makes the same offshore crossing to Cocos Island, offering a second option for divers chasing hammerhead schools, silky sharks, and the chance of a passing whale shark. The yacht is built for the long liveaboard format, with spacious staterooms and a large sun deck.

Like her sister vessel, she runs 10-day expeditions — a serious commitment, but the sightings at Cocos are hard to match anywhere else on the planet.