The world‘s finest diving

Sea Hunter

Redesigned with a diver's convenience in mind, Sea Hunter has served Cocos since 1995. At 115 feet (35 meters) her interior is truly luxurious but below, she's a remarkable workhorse.

A word from Dom : “Part of the Undersea Hunter Group, the Sea Hunter is one of the finest diving liveaboards anywhere. You’ll hear us rave about this fleet again and again. We charter her every year and every year it’s a roaring success. Can’t recommend her highly enough! to serious divers looking for the world’s finest liveaboard experience !” Dominick Macan


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On Board Sea Hunter

3 upper deck DOUBLE / TWIN cabins
with queen bed (+ optional twin bunk) & picture windows
3 lower deck TWIN cabins
2 twin beds & portholes
3 lower deck DOUBLE / TWIN cabins
queen bed (+ optional twin bunk) & portholes

All have private bathroom, individual AC controls, a flat screen TV/DVD player


all diving is done from skiffs
12 liter aluminium tanks (15 liter for rent) …. standard yoke (INT)
(DIN adaptor available by advance request)
nitrox & rebreather friendly
scuba rental gear available (request in advance)
water temperature: 79 F to 84 F (26 C to 29 C)
Advanced Open Water Diver certification & minimum of 25 hrs diving experience


accomodation, meals and non-alcoholic beverages
3 to 4 dives per day
tanks and weights
nitrox fills
transfers from & to a hotel in San Jose

TECHNICAL DIVING: full rebreather support; tri-mix support with helium; an assortment of bail-out & rebreather cylinders
support for all types of totally closed-circuit rebreathers (CCR); (EG Biomarine & Buddy Inspiration units with Sofnolime CO₂); scrubber material & high-pressure oxygen


international airfares
alcoholic beverages
National Park Fee + possible fuel surcharge
rebreather service & tanks (divers need to bring their own rebreathers)
scuba rental gear & 15 liter tanks
DeepSee submersible (on-board certain trips)


Designed For Diving, Photography & Ease Of Living

The top deck (bridge deck) features 2 large suites as well as an immense sun deck which doubles as an exterior dining area. You can make yourself at home reading in a lounge chair or catching some rays, or just hang out waiting for one of the sumptuous BBQs. The bow section of the Sea Hunter offers a spacious area for passengers to hang out, watch the dramatic sunsets and check out dolphins surfing the boat’s bow wake.

On the main deck, you’ll find a cozy study with comfy seating, a library … plus TV, VCR, DVD and a personal computer for editing video and digital photography. Mid-ship on this deck is the warm and welcoming formal dining room and adjacent to that an enormous, bright and airy lounge. You’ll find a variety of nightly entertainment: slide shows, DVDs, videos, games and more. The refrigerator is constantly refreshed and brimming with soft drinks, beer and ice for your pleasure and something to munch on is always within reach.

At the stern end of the main deck is the well-designed dive deck with fantastic camera storage area and super-sized swim platform … and even a private dryer for your towels and swim suits. For diving, each skiff takes up to nine divers & only one group is at any dive site at a given time. On the way to or from the dive sites, skiff drivers seek out the best spots for watching dolphins, mantas, whales, a promising bait-ball. Also, they’ll zip you up to some of the island’s most beautiful attractions, which are only reachable by small skiff.

The menu aboard is a satisfying combination of American and local Costa Rican cuisine. There are fresh tropical fruits, salads, fish, chicken, beef, and much more, all prepared in a wide variety of ways. Please let us know if you have any special dietary needs or requests.

Travel & Cruise Logistics

Costa Rica has two international airports. For optimum convenience, we recommend that you fly directly to San José (SJO) rather than the more distant Liberia International Airport.

Upon arrival in San Jose, take a taxi to your hotel. There are always taxis available at the airport and minivans for those of you who have a lot of gear. The night before departure, an Undersea Hunter representative will inform you at your hotel of your precise pickup time (generally between 8 AM and 1 PM) for transport to the dock and your awaiting vessel. The drive to Puntarenas, where you will board, takes about 3 hours, including a stop on the way for a snack or lunch. The price of this meal is not included in your trip package. After boarding, the vessel will take 32-36 hours to reach Cocos Island.

At the end of your Cocos adventure, you will usually disembark the boat at 8 AM and be transferred back to a hotel in San Jose. The transfer takes approximately 2 hours.

Layout & Specs

Deck & cabin layout, yacht specs, equipment & safety features
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Length: 115 ft / 36 m
Beam: 26 ft / 8.1 m
Draft: 8 ft / 2.5 m
Displacement: 250 tons
Construction: welded steel with teak work deck
Engines: twin GM 16V92 / 1200 total hp
Cruising Speed: 9.5 knots
Maximum Speed: 10 knots
Range: 3,500 nautical miles
Endurance: 30 days (limited by food supply)
Tenders: Two 24 ft heavy duty fiberglass dive boats
17 ft rigid bottom inflatable
Portable Generators: GM 6-71 75kw John Deere 105kw Portable Generator 5kw
Available Voltage: 110/220 VAC 60 Hz 3-phase 208 VAC 12 VDC
Fuel Tank: 20,000 US gallons (78 tons)
Water Tank: 15,000 gallons (60 tons) 1,800 gallons/day water maker

Safety: Two 25 person life-rafts.
Complete boat, crew and passenger safety gear.
Firefighting system throughout vessel.
Extensive first aid kit.

Diving Amenities: 20 personal diver locator systems.
Scuba Compressors: 2 HP compressors
1 nitrox generator
Scuba Tanks: 30 aluminum 80 cu/ft tanks
2640 cu/ft high-pressure storage bank
Technical Diving: Full oxygen, nitrox and rebreather service.
Guests must bring their own rebreathers.

3 GPS (Global Positioning Systems)
2 Radars (48 and 32 mile)
2 recording fathometers
Radio Direction Finder SIMRAD
Auto pilot
2 VHF radios
3 handheld VHF radios,
SSB radio (SEA 222)
Multi-system televisions, CD stereo and DVD player.
Desktop Computer
Starlit Telephone

12-ton deck mounted crane (55-ft reach).
33 ft by 24 ft (10.3m by 7.4 m) work deck space.
44 ft by 24-ft sundeck (1000 sq. ft.) and lounge chairs.
Fully equipped workshop with arc welding and oxy-acetylene cutting equipment/supplies

20 personal dive gear boxes, 20 personal camera lockers with stabilized and surge protected 110v outlets.
Air conditioning throughout the vessel


The itinerary at Cocos Island is simple … based on weather and sea conditions, you’ll dive all of the best that Cocos has to offer. Nothing more. Nothing less.

Itinerary and dive sites map

Your diving at Cocos Island will include as many of the sites below as time and weather permit.

Manuelita:  Whitetips, marble rays, manta rays, eagle rays, turtles, black tips, garden eels
Manuelita Outsite: Hammerheads, black tips, white tips, eagle rays, manta rays, yellow fin tunas, turtles, jacks, and whale sharks.
Viking Rock: Hammerheads, white tips, eagle rays, turtles
Dirty Rock: Hammerheads, white tips, black tips, marble rays, eagle rays, mobula rays, jacks, turtles, dolphins, and whale sharks
Punta Maria: Hammerheads, Galapagos sharks, whitetip reef sharks, blacktip sharks, marble rays, octopus, and eels
Big Dos Amigos: White tips, marble rays, hammerheads, mobula rays
Bait Ball: Green jacks, yellowtail grunts, rainbow runner, silky sharks, blacktip sharks, dolphins and tunas
Bajo Dos Amigos: Hammerheads, mobula rays, manta rays, eagle rays, sailfish, wahoos, black coral
Bajo Alcyone: Hammerheads, white tips, black tips, whale sharks, marble rays, eagle rays, mobula rays, manta rays, turtles, yellow fin tuna, silkies, sailfish, wahoos, dolphins
Lobster Rock: White tips, marble rays, manta rays, eagle rays, red lip batfish, frogfish, garden eels


Deepsee Submersible

The incredible, the fabulous, the one-of-a-kind DeepSee submersible is available for rent when you’re on a Sea Hunter trip if her sister-ship, Argo, is at Cocos at the same time.  This is normally the case unless Argo is on “special assignment” with a film crew or research group.   See DeepSee for all the information you need about “going for a ride” into the abyss.

True Dynamo Of A Vessel

The Sea Hunter was built as a dive support boat for the oil industry & has the power, strength & stability necessary for the long crossings to Cocos Island.  The strength of the vessel combined with her refined interior, put her, for many divers, into the gold standard amongst liveaboards.  She’s known for her great crew and fabulous dive guides who will take you to all the best dive sites, gearing their choices around the dictates of the weather and the currents. And when you’re not diving, you’ll find the services onboard equal the top-notch dive guiding, plus the food will never disappoint.  Each suite on Sea Hunter has a distinctly themed room, with hand-painted artwork by Carlos Hiller.

Due to it’s remarkably large size 33 ft by 24 ft (10.3m by 7.4 m) the deck is perfectly suited as a work space for film crews during special projects. On one side of the work-deck there is also an extendible crane with a 12-ton lifting capacity and the large open area on the deck was designed for landing a helicopter during special expeditions.

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