Nautilus Under Sea, Mexico

Name: Socorro - Giant Mantas, Dolphins & Sharks (Cabo San Lucas - Cabo San Lucas)
Start: 2027-02-04
End: 2027-02-12
Location: Mexico

8.9 Fabulous

Nitrox available
Jacuzzi / Hot Tub
En-Suite bathrooms
Aircon Cabins
Non-Diver (Snorkeler) Friendly
Warm Water Showers

from $ 307 / day Check dates

“This was our second trip on this boat and we have been 100% satisfied both times.”
Carolyn K, United States

Highlights

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

Date

Itinerary

Price

Select

16 Nov

9 Days / 8 Nights

$ 3,445

FULL

24 Nov

9 Days / 8 Nights

$ 3,445

FULL

02 Dec

9 Days / 8 Nights

$ 3,445

FULL

10 Dec

9 Days / 8 Nights

$ 3,445

FULL

18 Dec

9 Days / 8 Nights

$ 3,445

FULL

26 Dec

9 Days / 8 Nights

$ 3,445

FULL

03 Jan

9 Days / 8 Nights

$ 3,095

FULL

11 Jan

9 Days / 8 Nights

$ 3,395

FULL

19 Jan

9 Days / 8 Nights

$ 3,695

FULL

27 Jan

9 Days / 8 Nights

$ 3,695

FULL

04 Feb

9 Days / 8 Nights

$ 3,695

FULL

12 Feb

9 Days / 8 Nights

$ 3,695

FULL

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 ($100-192 / day), Port Fees ($35).

Optional Extras: Gratuities, Airport Transfer, Hotel Transfer, Alcoholic Beverages, Nitrox ($25-120), Nitrox Course ($245), Private Dive Guide ($255 / day), Rental Gear, Scuba Diving Courses, WiFi internet ($25-80).

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.

Pay by bank transfer or online with

Best Price Guaranteed

Boat features

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

Food & Drinks

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

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.

Diving

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

Languages Spoken

The crew speaks English and Spanish.

Gear Rental

Equipment is available for rent on this boat. Please provide your rental needs on the booking form. If the rental gear is not included in the price, you will need to pay for it on board the boat. Show prices

Drawings & Vessel Layouts

Cabin Types

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

Vessel

8.2
Crew

9.1
Food

9.5
Diving

9.3
Value

8.6

8.8 Fabulous
Michael S
United States

Whale sharks AND diving
Good experience - swimming with the whale sharks the highlight of the trip - it was a bucket list item…
Recommended for
Crew. Dive guides. Food.
19 Aug, 2026

10 Exceptional
Philip K
Germany

Very friendly giant mantas
great islands great sea creatures great ship great crew great adventure
Recommended for
Giant Mantas. Hammerhead sharks. Dolphins.
07 Dec, 2025

9.6 Exceptional
Maxim B
Netherlands

Beautifull divesites, awesome crew, boat and group!
Incredible trip. Enjoyed every second of it, both below and above surface.
Recommended for
Dive sites and animals. Vibe on board (crew and divers). Food.
29 Apr, 2026

10 Exceptional
Andrea F
United States

Another great trip to Socorro!
This was my second Socorro trip with nautilus and they are incredible. The dive guides are knowledgeable and patient, made me feel safe the entire time.
Recommended for
Crew. Food. Amazing dives.
24 Dec, 2024

8.4 Very good
Florence D
France

Intense dives in a very friendly atmosphere.
Great week - the day of watching and swimming with the whale sharks was awesome! We saw several of them and to be so close to them was magical! The dives where the sea lions came to watch US! 😉
Recommended for
The attentive crew. Food. The general usability.
19 Aug, 2026

Translated from French

9.6 Exceptional
Suzanne I
United States

Sea lions & whale sharks in the Sea of Cortez!
I just returned from an incredible week in the Sea of Cortez aboard the Nautilus Undersea. The diving was just incredible and definitive trip highlights were diving with the sea lions and snorkeling and swimming with the whale sharks. The boat crew were extremely friendly and worked nonstop and we had 3 amazing dive guides throughout the week. We learned quite a bit about the Sea of Cortez through various nightly presentations on board and also had fun swimming and kayaking during surface intervals. I can’t say enough about our chef as all the meals were fantastic and our hostess was so friendly and always smiling. What an incredible week!
Recommended for
Incredible diving with sea lions. Snorkeling and swimming with whale sharks. Very friendly crew.
21 Aug, 2025

9.2 Superb
Maria T
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
03 Jan, 2018

10 Exceptional
Frank V
Netherlands

A trip to a super place in the world that we will not soon forget because of these people
impression of the trip was "WOW" the people make your trip we always say and these people certainly did, especially our host did his best to make everyone feel at home, the dive guides do their best to show everything underwater
Recommended for
Staff, food and diving were fantastic. Safety on board is very high and well arranged. Care for diving due to the weather was well arranged.
23 Apr, 2026

Translated from Dutch

9.6 Exceptional
Philippe G
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
26 Aug, 2019

Translated from German

9.2 Superb
Allain D
France

Some unforgettable dives
A beautiful voyage in the Sea of CortezSome unforgettable dives A good understanding between the divers
Recommended for
The Chef's Kitchen. Whale shark and seal encounters. The availability of the team.
19 Oct, 2025

Translated from French

67 reviews

8.9 Fabulous
67 Verified Reviews

Sort reviews by:

9.6 Exceptional
Thierry P
France

An unforgettable trip to be rescheduled in the coming years
Fabulous trip, whale sharks, dolphins, manta rays in one and the same dive.Manta rays on every dive.A top crew ranging from captain, first mate, cook, room manager, dive guides.... All at the top in their respective fields
Recommended for
qualities of the dive sites. quality of the boat's crew. quality of the food served.
02 Jul, 2026

10 Exceptional
Derek M
United States

Incredible week - go here to see the BIG stuff!
Had an awesome week! The best pelagic big stuff diving I've had anywhere in the world, mantas on every dive, hammerheads, close encounters with dolphins, tons of sharks and humpback whale watching from the surface. The crew was great, and were willing to take us on a launch between dives to go snorkeling with a school of false killer whales. The captain coordinated with other boats so that we were the only boat at Roca Partida (having multiple boats would have reduced our dives there).
Recommended for
Saw tons of pelagics and lots of fish life!. Awesome crew, they worked hard and put us in the best position for good diving.. Great people on the boat and time to share stories..
01 Feb, 2026

8.4 Very good
Justin J
United States

Great value
Was great to dive somewhere new
Recommended for
Diversity in sea of cortez. crew effort. lots of diving.
16 Sep, 2025

9.6 Exceptional
Joel G
United States

best trip for the price
getting bumped by a great white and loosing balance in the cage.
Recommended for
Sharks, sharks and a sea lion chasing a small juvenile white.
12 Sep, 2018

8.0 Very good
Gwendoline U
France

An absolutely magical journey
The magnificent dives, the jacuzzi to warm up, the good meals and the great atmosphere
Recommended for
Manta rays, sharks, and the atmosphere on the boat
06 Jan, 2024

10 Exceptional
Carolyn K
United States

For a relaxing vacation choose Nautilus Undersea
Overall a very organized and well run trip. This was our second trip on this boat and we have been 100% satisfied both times.
Recommended for
Amazing crew. Good food. Cabins.
14 Jan, 2025

9.6 Exceptional
Younggil S
South Korea

Worth diving trip
In most divings, we can see something interesting. The crew members were nice and friendly. They help us enjoying the diving trips.
Recommended for
amazing diving experiences. good crew members. nice guides.
01 Jan, 2026

8.8 Fabulous
MAGDALENA B
Netherlands

Great experience
Great white sharks, great crew and participants, well organised
Recommended for
abundant great white sharks, amazing crew, comfortable boat
07 Dec, 2017

9.2 Superb
Anneke H
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
03 Dec, 2023

8.0 Very good
MARK E
United Kingdom

A pretty unique experience
The dive guides are very good, especially Rodolfo. They spot the sharks, mantas and dolphins usually before the group see's them. The food was also good, with no complaints of any illnesses. The boat and crew has a good attitude to safety and give some quite lengthy but essential safety briefings. My 2nd trip to Socorro, but hopefully there will be many more to come!
Recommended for
Wild dolphins that are tame and are not scared of divers. Manta's which love to hang around for most of the dive and interact with divers. Uncrowded dive sites with hardly any other dive boats around.
14 Jan, 2020

10 Exceptional
Scott T
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.
18 Oct, 2023

9.6 Exceptional
Laurie T
United States

Seahunter in August
Diving in the Sea of Cortez was beautiful at the end of August. It was very hot in the area and the boat’s AC worked well. The water was very warm and there were hundreds of fish to see. We were on the Seahunter and the boat is very spacious and comfortable. There is plenty of space and storage in the rooms. The dive deck is large with a big charging table. The crew was very helpful and we had wonderful dives.
Recommended for
The diving. The boat and room. The crew.
03 Sep, 2026

10 Exceptional
Philip H
United Kingdom

Fantastic diving at amazing locations
Fantastic diving at amazing locations. The boat is comfortable and there were no problems on our trip.
Recommended for
Amazing diving. Friendly and professional crew and dive guides. Other guests.
15 Dec, 2025

8.8 Fabulous
Vlad P
Germany

Superb cruise
Great atmosphere on the boat, the dive guides are superb. 4 dives a day, we saw everything: hammerheads nearby, a whale shark, tiger shark 2 times, and then other sharks and mantas by the dozen
Recommended for
Solo dives. The best suites - Roca Partida, Cañon, Bo I ler.... Manras, sharks and dolphins all the time, very close.
02 Mar, 2026

9.6 Exceptional
Lionel F
France

A must to do in your life as a diver!
- Encounters with unusual animals- Comfortable accommodation- The rhythm action - relaxation
Recommended for
Well-being, sensations, conviviality
05 Aug, 2022

10 Exceptional
Shelley S
United States

A must do trip for divers!
Even though the water was a bit chilly this liveaboard was a trip that I’d definitely want to do again and again. The crew worked together so well. It was like we were all a family by the end of the week. The food was delicious. The mantas and the sharks and the dolphins were incredible. At times I wondered if it was all real. The hot tub on top is a nice treat.
Recommended for
Animal life, seclusion, crew
25 Jun, 2024

10 Exceptional
alberto R
Mexico

Big schools of fish
Sea lions and huge schools of surgeons
Recommended for
Service, crew sea lions
24 Sep, 2023

8.8 Fabulous
Jean-Pierre J
United Kingdom

Baja California with the Nautilus
I had been waiting to do this trip for years and it didn’t disappoint The dive sites in the Sea of Cortez are legendary The staff were enthusiastic, professional and very friendly. Safety and comfort for the divers was always a priority. The dive guides managed to balance supervision and allowing freedom to roam underwater without compromising safety The dive equipment and set up was well maintained and well organized We sailed overnight to go to new trips every day. The food was delicious and generous portions made fresh every day. We enjoyed a wide variety of dives: drift dives, night dives, wreck dives and cavern dives. The highlight was a close encounter with a whale shark which was truly amazing! Diving with the sealions and seals was also a wonderful experience. Overall I highly recommend the trip which offers outstanding value for money.
Recommended for
The staff were extremely professional and friendly. The safety and comfort of divers was the priority. The dive sites were excellent and varied.
07 Oct, 2026

10 Exceptional
Thomas R
Germany

Spectacular shark encounters
The almost 6m tall "Lucy" and another female of almost the same size, which were often very close to the cages. Sighting of a total of almost 30 different great white sharks. The information from the professional crew about the sharks and their distinguishing features was also great. This gives guests the opportunity to photograph a shark that has not yet been registered and to give it a name. The spectacular jumps of the sharks out of the water were also sensational.
Recommended for
A great experience to experience the great white sharks so closely, the warmth of the crew and the possibility of unlimited cage diving.
15 Nov, 2018

10 Exceptional
Samantha E
Mexico

Spectacular trip
Revillagigedo is beautiful, lots of life, sharks, mantas, dolphins, whales. The boat super comfortable, the crew does everything to give you the best experience possible. The only thing is that there is a day when you have to stop for the navy to do a check-up and there the diving is not good at all. It would be nice if other better dive spots were explored for that day.
Recommended for
The crew. The food. Marine life.
19 Mar, 2026

Translated from Spanish