Nautilus Under Sea, Mexico



    • Ex-research vessel with unique history
    • Face-to-face encounters with Giant Pacific Mantas
    • Dolphins, whale sharks, hammerheads, and humpback whales

The latest addition to the Nautilus fleet in Mexico, the 27m Nautilus Under Sea offers divers spectacular dive tours to the Socorro Islands in Mexico. An ex-research vessel with her claims to fame, including being the support boat for the James Bond Movie "License to Kill" and a Deep Rover mission with Dr. Silvia Earle, as well as many research and photography missions, the former Under Sea Hunter, has now re-located to Mexico. She caters to 19 guests in 9 en-suite, air-conditioned cabins. The Undersea Hunter also offers plenty of room for relaxation, with a comfortable lounge and dining area and a large sun deck with loungers.

The dive deck offers ample space for kitting up and gear storage, as well as camera set-up and personal camera storage areas. The Nautilus Under Sea offers an amazing destination - the Socorro Islands. Diving the Socorro Islands, divers will come face to face with Giant Pacific Mantas, known as the friendliest mantas in the world! Also, there are sightings of up to 10 different kinds of sharks, dolphins, whale sharks, hammerheads, and humpback whales. Nautilus Under Sea offers 6-day trips with a pick-up in San Diego and leaving from Ensenada from July to November.

Don’t miss out on these amazing trips. Book online today to start your adventure.

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Included: Drinking Water, Soft drinks, Tea & Coffee, Welcome Cocktails, Full-Board Meal Plan (All meals), Snacks, Special Dinner, Diving Package, Kayaks, Stand Up Paddleboard, Cabin Towels, Complimentary Toiletries, Deck Towels.

Required Extras: 5% VAT, National Park Fees, Port Fees (35 USD).

Optional Extras: Dive Insurance, Travel Insurance, Gratuities, Airport Transfer (25 USD), Hotel Transfer, Alcoholic Beverages, Nitrox, Private Dive Guide, Rental Gear, WiFi internet.

Book now, pay later: You can easily place your booking online. We will then hold the spaces for you and you can confirm with a payment later.

* Extra fees are shown per person.

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Boat features

  • Camera Station
  • Daily housekeeping
  • Audio & video entertainment
  • Air Conditioned saloon
  • Aircon Cabins
  • Sun Deck
  • Indoor Saloon
  • Non-Diver (Snorkeler) Friendly
  • Warm Water Showers
  • Custom built for diving
  • Charging stations
  • En-Suite bathrooms
  • Paid Internet
  • Non-Smoking Rooms
  • Outside Showers
  • Seaview Cabins
  • Kayaks On-Board
  • Snorkeling Equipment
  • Dedicated Local & International Crew
  • Nearly 1:1 Crew-to-Guest Ratio
  • Leisure Deck
  • Observation Deck
  • Bar
  • BBQ Area
  • Available for Charter
  • Jacuzzi / Hot Tub
  • Stand Up Paddleboard

Food & Drinks

  • Western Food
  • Local Food
  • Vegetarian Options
  • Buffet style
  • Beer available
  • Snacks All Day
  • Vegan Options
  • Fine Wines Selection
  • Free Soft Drinks
  • Wine Available
  • Set Menu Dinner
  • Fine Cuisine
  • Welcome Cocktails

If you have any specific dietary requirements whilst on-board your cruise, you can add this to your special requests on step 2 of the booking form. We advise limiting these requests to religious beliefs or food allergies.


  • DIN Adaptors
  • Nitrox available
  • Rebreather Support
  • Rinse Hoses
  • Dive deck
  • Tenders for diving
  • Sidemount Diving
  • Shaded Diving Area

The crew speaks English and Spanish.

Gear Rental

There is diving gear available on this boat. Please provide your rental needs on the booking form. See below for further details on inclusions and pricing. Show prices.

Drawings & Vessel Layouts

Nautilus Under Sea Deck Plan floorplan

Boat Specifications

  • Year built 1968
  • Year renovated 2016
  • Length 105ft
  • Beam 24ft
  • Top speed 9.5 knots
  • Cruising speed 9 knots
  • Engines Twin Caterpillar 240 hp ( Total 480 HP )
  • Max guests 19
  • Number of cabins 9
  • Number of bathrooms 9
  • Tenders One 22 ft. heavy duty fiberglass dive boats One 17 ft. rigid bottom inflatable
  • Water capacity 6000 gallons
  • Fuel capacity 8000 gallons
  • Freshwater maker 1800 gallons/day

Boat Navigation and Safety

  • Radar
  • Depth Sounder
  • GPS
  • Radio VHF/DSC/SSB
  • E.P.I.R.B. Distress System
  • Emergency Rafts
  • Life Vests
  • Fire Alarm & Fire Extinguishers
  • Oxygen
  • First Aid Kits
  • Satellite & mobile phones
  • Crew trained in first aid
  • Emergency flares

Nautilus Under Sea Reviews

  • 8.8 Fabulous
  • 25 Verified Reviews
  1. Vessel
  2. Crew
  3. Food
  4. Diving
  5. Value
  • 9.2 Superb
  • Wilhelmus R
  • Netherlands Netherlands
Excellent dive trip, seen a lot, professional friendly crew, well organized,

Spending hours with Mantas with very close encounters, dolfins close by, wales nearby, many sharks 7 types.

Recommended for
Team spirit and positive atmosfeer. good food and service. engaged proff. divemasters.
  • 9.2 Superb
  • Fabian F
  • Argentina Argentina
Gran Experiencia a Bordo

El encuentro y la interaccion con las mantas gigantes, es una experiencia unica!!! Pero no ha de ser de la unica vez, ya dan ganas de retornar apenas termina el ultimo buceo!

Recommended for
Lo mejor del crucero fueron los buceos, magnificos todos, siempre con avistajes maravillosos de mantas, tiburones y mucho mas. La calidad de la atencion a bordo por parte de toda la tripulacion, muy esmerada y esforzada siempre, y por ultimo el grupo de buzos con el que compartimos el crucero, la pasamos super bien
  • 10 Exceptional
  • Marie-Josee H
  • Canada Canada
Adventurous, yet safe and confortable, unforgettable!

Whale shark, ball of fishes and swirdfish

Recommended for
The dive, the crew and the guests!
  • 9.2 Superb
  • Maria T
  • United States United States
amazing crew that went above and beyond

Nautilus Under Sea is a very comfortable boat, with nice cabins, lots of storage space and very nice bathrooms in cabins. Diving deck organization was perfect, enough space for everyone, large table for cameras. The diving crew was very helpful, enthusiastic, and managed the diving part in an extremely safe and organized manner. Even when the diving conditions were difficult because of the weather, they expertly got everyone in and out of skiffs. All in all, amazing experience of diving with mantas, dolphins, Galapagos, silky sharks and other marine life, which is abundant in the Socorro.

Recommended for
sharks, mantas, and crew attitude
  • 8.0 Very good
  • Andreas T
  • Austria Austria
Great if you like big fish

Good trip for more experienced divers. A lot of blue water and current but most of the time it is worth the wait and struggle because you see a lot of big fish you only find on some other places. Boat has been refitted and is nice and has good standard. Very nice crew, DMs are experienced and won‘t look after you all the time. Trip to the islands is long and exhausting though especally if the swell comes in. Overall a very good trip to check off some large pelagic fish and sharks.

Recommended for
Hammerheads Whaleshark Mantas
  • 8.8 Fabulous
  • Netherlands Netherlands
Great experience

Great white sharks, great crew and participants, well organised

Recommended for
abundant great white sharks, amazing crew, comfortable boat
  • 8.8 Fabulous
  • Michael R
  • Canada Canada
Great White Shark Diving at Guadalupe Island

Full points for the crew, food. and the diving experience. It is well deserved. The cabin comfort didn't rate full points because we had issues with the central air in the cabins below decks. Our room was too hot while someone else was getting all our cold air. We were offered and accepted an upgrade to the premium cabin, so it ended well for us, and the captain said they will work to resolve this problem in the future. As someone with thousands of dives around the world, and having seen thousands more sharks, I wasn't enthusiastic about diving in a cage, but I also hadn't seen great white sharks before. After this experience, I would do it again. I averaged 4 to 5 hours a day in the cages watching the great white sharks, and they didn't disappoint me. They were very photogenic, with lots of photos and videos made. It is an experience even the "hardcore" divers should try. Bring a drysuit if you have one, or the thickest wetsuit you have. The water is cool, and you'll be able to stay in longer and more comfortably.

Recommended for
1. Seeing the great white sharks. 2. Seeing Bullet, a very large female that hadn't been seen in the last ten years. 3. Up close encounters with great white sharks.
  • 10 Exceptional
  • gregory M
  • France France
the best of my life

huge pregnent femelles around the cage

Recommended for
the place,the boat,the staff
  • 9.6 Exceptional
  • Philippe G
  • France France
Fantastic Meetings with Great White Shark

- Hunting Great Whites - Blue Sea - again... Great White Sharks each Day

Recommended for
- Big Sharks / Nice Crewe and good Food / to be in Guadalupe
  • 10 Exceptional
  • Thomas R
  • Germany Germany
Spektakuläre Haibegegnungen

Die fast 6m große "Lucy" und ein ein weiteres Weibchen von fast der gleichen Größe die oft sehr nahe an den Käfigen waren. Sichtung von insgesamt fast 30 verschiedenen großen weißen Haien. Toll waren auch die Informationen der professionellen Crew über die Haie und deren Unterscheidungsmerkmale. Dadurch besteht die Möglichkeit für die Gäste einen noch nicht registrierten Hai zu fotografieren und ihn einen Namen zu geben. Sensationell waren auch die spektakulären Sprünge der Haie aus dem Wasser.

Recommended for
Ein tolles Erlebnis die grossen weißen Haie so hautnah zu erleben, die Herzlichkeit der Crew und die Möglichkeit des unbegrenzten Käfigtauchens.