Nautilus Under Sea, Mexico

Name: Ultimate Whale Sharks in the Sea of Cortez (Cabo San Lucas - La Paz)
Start: 2026-10-03
End: 2026-10-10
Location: Mexico

9.0 Superb

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

from $ 281 / 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

24 Jun

12 Days / 11 Nights

$ 3,645

FULL

05 Jul

8 Days / 7 Nights

$ 2,750

Select Cabin only 1 space left

12 Jul

8 Days / 7 Nights

$ 2,695

Select Cabin only 1 space left

19 Jul

11 Days / 10 Nights

Children Special: 20% OFF for ages 12–15. Valid for a limited time only. T&Cs apply.

$ 3,095 Deal %

Select Cabin available

29 Jul

11 Days / 10 Nights

$ 3,695

Select Cabin only 3 spaces left

08 Aug

8 Days / 7 Nights

$ 2,345

FULL

15 Aug

11 Days / 10 Nights

$ 3,695

Select Cabin available

25 Aug

6 Days / 5 Nights

Female Shared Cabin.

$ 1,845

Select Cabin only 1 space left

13 Sep

7 Days / 6 Nights

$ 2,145

Select Cabin available

19 Sep

8 Days / 7 Nights

Children Special: 20% OFF for ages 12–15. Valid for a limited time only. T&Cs apply.

$ 2,645 Deal %

Select Cabin available

26 Sep

8 Days / 7 Nights

$ 2,545

Select Cabin only 1 space left

03 Oct

8 Days / 7 Nights

$ 2,745

Select Cabin only 5 spaces left

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 (100-172 USD per day), Port Fees (35 USD).

Optional Extras: Travel Insurance, Gratuities, Airport Transfer, Hotel Transfer, Alcoholic Beverages, Nitrox, Nitrox Course, Private Dive Guide, Rental Gear, Scuba Diving Courses, 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.

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

9.0 Superb

Vessel

8.4
Crew

9.2
Food

9.5
Diving

9.3
Value

8.7

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

9.2 Superb
Ernesto R
United States

Dive of a lifetime.
Some of the best diving I've ever done. Great staff with loads of knowledge. Calm seas. All types of sharks. Ah the whale shark tried to kiss me. If you see dolphins, instead of pointing a camera at them, play with them. Spin and flip. They'll join you.
Recommended for
Captain beto. Bati dive guide. Helpful staff.
12 Jun, 2026

10 Exceptional
Andrea R
Mexico

It was incredible!
The entire crew worked incredibly well together and created such a fun, welcoming, and professional atmosphere onboard. We had an amazing experience onboard from beginning to end!
Recommended for
Marine life. Landscapes. Crew and people.
23 May, 2026

9.6 Exceptional
Hélène P
France

Best diving trip with best crew
This trip to Socorro felt so special, we had an amazing crew taking care of us underwater and on the boat, we were diving so remotely that it felt really unique, the dives sites are magical. Really recommend Nautilus as it’s a really safe company and crew members are really awesome!
Recommended for
Amazing crew. Best diving experience. Excellent food.
21 Apr, 2026

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

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

9.2 Superb
Bruce P
Canada

Excellent
Diving trip done in August 2025. We really enjoyed our time on the Nautilus Undersea. Crew was amazing and worked very hard at making we were happy and comfortable. Safety of guest was taken very seriously. Well organized. Swimming with Whale Sharks was great. We did one night dive and it was the best night dive we have ever done so far. Boat is a bit old but we were comfortable. No complaints at all. We are already planning our next dive trip in Socorro with them.
Recommended for
The crew. Diving. Food.
18 Aug, 2025

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
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

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

59 reviews

9.0 Superb
59 Verified Reviews

Sort reviews by:

8.4 Very good
Richard W
United States

White shark express
The crew went out of their way to make your experience a fantastic and memorable one. The opportunity to see multiple white sharks from up close was amazing. There was never a wait to get into a cage so you could essentially soak as long as you wanted to! Would recommend this trip and boat.
Recommended for
Experience white sharks up close in a controlled and safe manner for both the animals and guest, crew and service
27 Jul, 2021

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

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

Translated from German

10 Exceptional
Glen D
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.
17 Feb, 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

10 Exceptional
Bruno I
Switzerland

unforgettable experience
The underwater world has surpassed everything seen so far. The crew on the boat was super friendly, helpful and took care of the well-being of the guests. An all-round successful trip. Come back on this boat, the number of guests is ideal, so you don't get in each other's way under water.
Recommended for
Underwater world, food, service from the crew
22 Apr, 2023

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

9.2 Superb
Richard L
Canada

Amazing Liveaboard Experience with exceptional diving
I would recommend this trip to any diver interested in exceptional diving.
Recommended for
The wildlife encounters were amazing, from pelagic mantas on almost every dive, to 5 different types of shark, some huge, and a school of 1000+ 50 kg to 150 kg yellow fin tuna. Amazing!. The crew was amazing. The captain's leadership in delivering customer satisfaction. From driving zodiac skiffs, to clearing tables on occasion, nothing escaped his attention to detail. All efforts directed at delivering the best experience possible for the divers. The passengers gelled rapidly, with participants from Argentina, Brazil, Switzerland, Austria, Belgium, Taiwan, Canada and the U S.
30 Jan, 2026

9.2 Superb
Natalie M
United States

Great diving but few dives
I had a wonderful trip! The dive sites were full of life, and I was thrilled to spot my very first sea horses - three in total, including a pregnant one. The sea lions were such a highlight, endlessly playful and fun to watch. The warm water was another pleasant surprise - I didn’t even need a wetsuit! The only downside was the limited number of dives. Because the itinerary required a lot of travel north, we were only able to do 15 dives over the week. There was even a day where we couldn't get in the water at all. On other liveaboards I’ve joined, we were diving everyday and the range was closer to 23–27 dives. Since I don’t get to dive often at home, I would have loved the chance for a few more underwater hours.
Recommended for
Dive sites were full of life. Crew was professional and friendly. Sky at night was stunning.
21 Aug, 2025

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

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

8.8 Fabulous
Stefan L
Switzerland

great experience but expensive
diving with Mantas, hammerheads and dolphins
Recommended for
dives, friendly staff, fantastic dive sites
05 Dec, 2022

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

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

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

6.8 Review score
Martin S
Denmark

Long travel but worth it.
Tigershark, Dolphin, Hammerhead and more. Very remote location and a good spot for the big stuff.
Recommended for
In my book, the food on board earns a Michelin star or two. Now, I need to get my weight down again.. A warm and friendly vibe, thanks to the lovely people on board. Improving my Spanish – the devil is in the details. "...Kalimotxo/Calimocho" vs. "...Cola Mucho" - huh.
01 Jul, 2025

8.0 Very good
Isabell L
Switzerland

Insane diving, friendly staff, bad cabin
The diving was insane - we saw schools of scalloped hammerheads, great hammerheads, tiger sharks, doplhins (!), so many giant manta & a whale shark!! The dive guides were awesome, espacially Slavic & his presentations about the animals. They made good vegan food for the 3 of us. It was delicious, but sometimes a bit unfortunate because they gave the vegan protein (like soy granulate) to everyone (buffet-style) - thats why they didnt have have enough vegan protein for us for every meal. The boat is a bit old, but overall in good condition, the hot tub was super nice! Only bad thing: The Triple Stateroom… It was right next to the kitchen and common area, so it was always loud! And it was at the very front of the boat & you could feel every wave twice as strong.. We were not seasick on the boat, but as soon as we spend a bit time in our room we got super sick… You just go up and down sooo much. The shower was also aweful.. No pressure at all & you almost fell out everytime because it was tilted. Would definitely do this trip again! Just not that room…
Recommended for
Sharks, Dolphins & Mantas. Dive Guides. Jacuzzi.
15 May, 2026

7.2 Good
Celeste K
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
1.school of hammerheads, 2. dolphin encounters, 3. mantas on every dive
11 Apr, 2024

8.4 Very good
Igor I
United States

Highly recommended trip to experience big pelagic animals
Manas, Sharks, Dolphins !!!!! Specially mantas on Boiler and Roca Partida
Recommended for
The crew was absolutely amazing and very friendly and accommodating. The nature itself : the best diving spot I ever visited. the way crew managed divers at different levels from very beginners to experienced marketing everybody comfortable and the diving experience enjoyable.
27 Jun, 2025