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Nautilus Under Sea

Under Sea Ext island opt 1

At 95 feet (29 meters), Nautilus Under Sea may not be the largest vessel in this region but don't let that fool you. In terms of comfort, she is equal to the rest & is a true diver's dream boat.


A word from Dom :  "The original liveaboard of the Undersea Hunter Group in Cocos, Nautilus Under Sea has moved to the waters of Socorro & Guadalupe. She is the favorite of many divers (myself included) for her intimacy & comfort level and never fails to amaze her guests. Everything is as close to perfection as it gets. She's an old favorite who well deserves her long-standing fabulous reputation."  Dominick Macan

  • 1 premium upper deck DOUBLE/TWIN suite
    king bed or 2 adjacent twin beds & picture windows
    1 main deck TWIN suite
    (disabled friendly)
    2 twin beds & picture windows
    1 main deck TRIPLE suite
    3 single beds (2 in bunk style) & porthole
    5 lower deck TWIN cabins
    1 double bed & 1 single bed (bunk style) & porthole
    1 lower deck TWIN cabin
    2 twin beds (bunk style) & porthole

    All cabins have individually controlled air conditioning & ensuite bathrooms.

  • Socorro up to 4 dives per day 
    (depending on sea conditions)
    Guadalupe - unlimited cage dives
    12 liter & 15 liter aluminium tanks 
    (15 liter at extra cost)
    aqualung gear rental
    (request in advance)
    rebreather support
    (request in advance)
    INT not DIN tank valves
    water temperature: 73 - 82F, 23 - 28C
    5 - 7mm wetsuit recommended
    divers must have Advanced Open Water & 50 logged dives  ...  maximum authorized depth: 30 meters

  • accommodation & diving
    meals, snacks & non-alcoholic beverages
    compressed air, tanks, weights and weight belts
    use of sea kayaks
    (except at Guadalupe)
    a lounge area in a local hotel until boarding time

  • international & domestic airfare

    transfers to & from the hospitality suite
    alcoholic beverages
    optional wifi

    Aqualung rental gear (request in advance)
     re-breather support & steel tanks
    15 liter tanks
    port fee
    dive insurance & dive courses

On board Nautilus Under Sea

  • Under Sea stern aerial view opt
    aeriel view stern
  • Undersea Sundeck opt 1
    sun deck
  • Undersea salon opt
    main salon
  • Undersea salon dining area opt
    dining area
  • Undersea Premium Suite opt
    premium double suite
  • Under Sea dbl twin stateroom b opt
    twin stateroom
  • Under Sea suite opt
    disabled friendly suite
  • Under Sea triple stateroom opt
    triple stateroom
  • Under Sea bathroom b opt
  • Undersea dinghy opt
    dive dinghy

Deck Plan ... Dive Map ... Technical Specifications

Itinerary map, deck & cabin layout, yacht specs, equipment & safety features for Nautilus Under Sea                 .... open




Under Sea Sundeck plan opt


Undersea Maindeck plan opt


Undersea lowerdeck plan opt


Undersea Map Socorro opt


Length: 105 feet (32 meters)
Beam: 24 feet (7 meters)
Built: USA
ISM safety certified
18 guests, 9 ensuite staterooms & suites
Internet access & satellite phone
Caterpillar engine power
Air fills, nitrox, rebreather friendly

New Life & New Look ... in Socorro & Guadalupe

Beginning in October 2016, the much beloved Undersea Hunter became Nautilus Under Sea ... her mission to carry divers to revel in the magic of the mantas, sharks and whales of the magnificent Revillagigedo Islands (including Socorro) off the western coast of Mexico. She also offers cage diving with great white sharks at Guadalupe Island.

To become the Nautilus Under Sea she underwent a massive refit & renovation including the addition of a premium suite on the upper deck, the installation of a new stability system, a bulbous bow, plus an upper deck lounge, bar & hot-tub. Also, she has a new full-width superstructure with dining room & lounge area with big comfy couches on one side and the dining room on the other side.

For your non-diving hours the boat offers a large sundeck with lounge chairs, but also ample entertainment including, a multi-system television and VCR, CD stereo and slide projector, DVD player and Multimedia Sony VAIO Laptop Computer for your use. 

From the bow space you can enjoy vistas of sunsets, approaching islands or dolphins surfing the boat's bow wake.

Disabled-Friendly Refurbishment 

Perhaps most exciting of all is the fact that the new stateroom adjacent to the dive deck is designed to be accessible for guests with physical handicaps. The entire main deck is now wheelchair accessible including dining room and lounge, stateroom, head and dive stations with a ramp down to the lower swim platform.

The Nautilus team love the idea of making the great white sharks and giant mantas more accessible for handicapped divers.

From Bond girl to dive vessel

The Nautilus Under Sea started her life as a research vessel, built in Florida in 1968 for Perry Oceanographic, and she was used for twenty years as a submarine support vessel. Working primarily in the Bahamas and the Caribbean, she completed hundreds of research and photographic missions including the Deep Rover Project with Dr. Sylvia Earle.

The Under Sea's closest brush with fame - so far - was her participation as support vessel for the James Bond movie "License to Kill".

Last but certainly not least  - the food

You can expect a fusion of Mexican and North American food with fresh baking, produce and vegetables.  Vegetarian, vegan, gluten-free, food allergy options and quasi kosher menus are available with at least 30 days prior notice.  A pre-dive continental breakfast with fresh baked goods, fruit & cereal while a full breakfast is usually served after the first dive. Lunch is served with salad and soup of the day and can typically include deli-sandwiches with fresh bread, homemade pizzas, fish tacos, burgers, fajitas with fresh salsas & lots more. Dinner is usually buffet or family style with a nice array of both Mexican and American style meals.

Crew will be on the back deck to meet you after every dive with a big smile and a tray of homemade goodies, drinks and snacks.  Tea, coffee, juice, soda are included in your trip price. You'll also find a wide variety of alcoholic beverages in the bar including: red wine, white wine, champagne, vodka, gin, tequila, rum, mezcal, brandy, bourbons, single malt scotch and beer (mexican and domestic).


Nautilus Under Sea itineraries include the Revillagigedo Islands; San Benedicto, Socorro & Roca Partida in addition she makes trips to Guadalupe Island. 

Guadalupe  (August - October)

5-night trips to Guadalupe with 3 full days of cage diving.

Socorro (November - May) 

Below you will find a typical 8 night Socorro itinerary but this is subject to prevailing weather conditons on the day, the captain and crew will do their utmost to give you the best dives each day and to achieve this the itinerary is flexible.

Day 1 - Enjoy the Cabo Dive Center at the Tesoro Los Cabos. Boarding begins at 8:00 PM.
Day 2 - At Sea. Evening arrival at San Benedicto Island.
Day 3 - Diving Day! San Benedicto is home to the friendliest giant mantas in the world!
Day 4 - Dive at Socorro Island. Night snorkel with Silky Sharks.
Day 5 - Dive at Socorro Island.
Day 6 - Dive at Roca Partida.
Day 7 - Dive at Roca Partida.
Day 8 - Voyage home. Making your way back to Los Cabos.
Day 9 - Disembarkation at 8:30 AM. 

Your cruise logistics


You have two options for airports for your Guadalupe adventure.You can fly into the San Diego airport (SAN), and then proceed to the Nautilus San Diego Dive Center. Alternatively you can also fly into the Tijuana airport (TIJ). 

If meeting the Nautilus team at their San Diego Dive Center, they will load baggage and depart at 7:30 pm for the approximate 2 hour transfer to where your ship will be waiting for you in Ensenada, Mexico. Mexican custom regulations require all guests exit the vehicle at the border with their belongings, obtain a tourist card and then walk through customs before boarding the vehicle again. The Nautilus staff will help you with this procedure.  Alternatively, guests may also meet the Nautilus team directly in Ensenada, Mexico. If you are meeting them directly in Mexico and you are not a Mexican citizen, you must stop and get an FMM.

At the end of your cruise the ship normally arrives back at Ensenada approx. at 2:00PM. Arrival time is always subject to weather and may be later. Guests who met the crew in Ensenada will be be transferred back to Tijuana Airport in Ensenada. Guests who met them in San Diego will be transferred back to San Diego Dive Center or San Diego Airport. The coach typically arrives in San Diego by 7:00 PM. Please do not book return flights earlier than 9:00 PM.


You will fly into the San Jose del Cabo airport (SJD), and then proceed to the Nautilus dive center at the Tesoro Los Cabos in Cabo San Lucas. There you can leave your bags and then tour town and enjoy a nice dinner before boarding the ship. The crew is working hard right up to boarding time to get the ship ready so please meet them at the hospitality suite and not at the boat. 

On the final day disembarkation is at 8.30am for transfer back to San Jose del Cabo airport (SJD). We recommend that you book your return flights for 10:00 AM or later.


Socorro giant manta belly friends shutterstock 384104389 opt

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