Nautilus Under Sea, Mexico

Excellent diving and guidance

“PRO: amazing wildlife sightings and interactions, mantas on every dive. Interacting with the dolphins are what dreams are made of!…”

Celeste K, United States United States
Read 32 more reviews


    • 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.

Choose your departure date


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, Dive Insurance, National Park Fees (100 USD per day), Port Fees (35 USD).

Optional Extras: Travel Insurance, Gratuities, Airport Transfer (25 USD), Hotel Transfer, Alcoholic Beverages, Nitrox (125 USD per trip), 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

#deckplan 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

  • 8.9 Fabulous
  1. Vessel
  2. Crew
  3. Food
  4. Diving
  5. Value
  • 7.2 Good
  • Celeste K
  • United States United States
Amazing dolphin encounters

PRO: amazing wildlife sightings and interactions, mantas on every dive. Interacting with the dolphins are what dreams are made of! Saw school of hammerhead sharks. Amazing crew (Idris, Alicia). Most dive guides were attentive and excited to point out wildlife. Hot tub was a plus after cold dives CON: older boat, something was always broken (hydraulics for the anchor, clogged toilets, broken ice maker and water dispense), 9 crew for 18 ppl so no one was helping us put our gear on, first liveaboard that didn't clean your room daily even when we had ppl who got sick with norovirus on the trip, food was average

Recommended for of hammerheads, 2. dolphin encounters, 3. mantas on every dive
  • 10 Exceptional
  • Glen D
  • United States United States
Awesome crew, amazing diving, and well run operation.

Dolphins, hammerheads, tiger shark, mantas, and the wonderfully friendly crew. The food was good. The top deck can get a little fumey while motoring, so I'd encourage the boat to raise the smokestack or otherwise get creative with the exhaust fumes so that its more comfortable to hang out while motoring.

Recommended for
The crew was absolutely wonderful, the diving and competence of the crew were excellent, and the boat operated like clockwork.
  • 10 Exceptional
  • Scott T
  • United States United States
The ship and the crew made for a wonderfully delightful dive trip experience.

Of course, the CALIFORNIA SEA LIONS!!! Such beautiful animals. They are comfortable with divers and getting to experience them up close and personal is something i'll remember until my dying day.

Recommended for
I can't say enough about the care that the crew showed for all of us on board. Everyone was incredibly attentive to my needs. The food, dive guides, captain and steward were, not only incredibly competent, but carried out their duties with a care to detail and fun loving attitudes. Really, a fantastic trip.
  • 10 Exceptional
  • TARA L
  • United States United States
Best diving adventure I ever had! Giant Mantas, 6 species of sharks amazing crew and service!

It was great to spend the last of 2022 and the start of 2023 in such a beautiful place, with great dive buddies and excellent staff and divemasters

Recommended for
Location, Service from Crew, Big Animals
  • 8.8 Fabulous
  • MARK B
  • United States United States
Absolutely a fantastic trip

The entire experience was once in a lifetime.

Recommended for
The mantas, dolphins and crew.
  • 8.0 Very good
  • Beryl C
  • Malaysia Malaysia
Good diving

Hammerhead sharks

Recommended for
Services, dive sites, crews
  • 9.2 Superb
  • Anneke H
  • Germany Germany
Great experience

Having so many mantas and went even lucky with hammerheads. The crew was always friendly and helpful

Recommended for
Mantas, hammerheads and great people
  • 10 Exceptional
  • alberto R
  • Mexico Mexico
Big schools of fish

Sea lions and huge schools of surgeons

Recommended for
Service, crew sea lions
  • 8.8 Fabulous
  • Stefan L
  • Switzerland Switzerland
great experience but expensive

diving with Mantas, hammerheads and dolphins

Recommended for
dives, friendly staff, fantastic dive sites
  • 9.2 Superb
  • Jon H
  • United Kingdom United Kingdom
An outstanding experience, I'll definitely dive with Nautilus again.

Sea lions! Who knew they were so much fun under water :) Good viz and great diving all-round, covering an excellent range of sites (and more dives than advertised - 16 vs the 12). Sundowners and beers (from a very well-stocked bar) under the stars. All made extremely easy and enjoyable by the wonderful staff.

Recommended for
The staff were all fantastic, friendly, extremely professional but also engendered a relaxed, enjoyable experience. The vessel is in good repair, well set up for diving and relaxing. And the trip is all made very easy and efficient by the shoreside support.