Twenty years from now, you will be more disappointed by the things you didn’t do than those you did.
– Mark Twain
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Beautiful Giant Mantas, Dolphins, Sharks, Bait Balls and so much more.“This is my second trip with Nautilus Dive Adventures and they exceeded my expectations again!!The first trip was Great Whites at Guadalupe Island on the Belle Amie in 2017.I…
Todd, Dayna, 4 July 2024→ Read More -
Incredible diving at Socorro!Socorro, Socorro, Socorro! This will most certainly be my response the next time a fellow diver asks me where I recommend to go diving. When they ask me how they should get there, …
Mike, 4 July 2024→ Read More -
Emotional encounter with Giant MantasEverything about this trip is truly otherworldly! You feel like an astronaut in the ocean, exploring the unknowns and meeting graceful aliens. Diving with oceanic mantas is indescr…
Tatjana, 3 July 2024→ Read More -
40 minutes of interaction with giant mantas, sharks, and dolphins!There is no words to describe the glorious expedition with our guide Emilio at Socorro Isla. First he made sure everyone was well prepared and assured everyone in the group had a g…
Rogelio Dominguez, 1 July 2024→ Read More -
Surrounded by five friendly giant mantasWhen I booked this trip, I never imagined I’d find myself in the middle of 5 gigantic oceanic mantas circling around our group. They were so curious, they passed feet away fr…
Joe, 30 June 2024→ Read More -
Captain’s Noon Reports – Gallant Lady – 2024-11-05 – 5 November 2024On our first day of searching for bait balls was very good, had encounters with several small bait balls but with a lot of marlins.→ Read More
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Captain’s Noon Reports – Explorer – 2024-11-05 – 5 November 2024Checkout dive at Fondeadero was nice, one giant manta around that most people saw and a pod of dolphins was nearby, many people see dolphin.→ Read More
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Captain’s Noon Reports – Belle Amie – 2024-11-05 – 5 November 2024Guests disembarked with no issues, they were happy, Trivia game last night was exciting and everyone attending was happy.→ Read More
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Captain’s Noon Reports – Explorer – 2024-11-04 – 4 November 2024We made a weather course and just now able to start pointing the boat in the right direction without rolling.→ Read More
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Captain’s Noon Reports – Belle Amie – 2024-11-03 – 3 November 2024This morning we did two dives, the action this day have been incredible. Some saw Galapagos. The horse eyed jacks, lots of white tip sharks.→ Read More
Socorro, Sea of Cortez, Mexico Sardine Run, Cocos Island, San Ignacio Lagoon
We do it all. If there are cool big animals, we want to share the experience with you. Our adventures combine the utmost safety, comfort and luxurious touches with excellence in guest experience. From orcas and mobula rays to super playful dolphins, great whales, 12 species of sharks, giant mantas, and so much more. We cover it all. The only question is which expedition to sign up for next!?
Featured Upcoming Adventures
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Celebrating 50 years with 50% off sale
Orcas and Whale Sharks
This is a unique trip overlapping 2 seasons in July combining mobula rays / orcas / whale sharks with spotter airplane support. So, break out the good china, sign up for a trip, and join us for a very special 10 day / 9 night ultimate whale expedition this summer.
More info -
Early booking discount $*
October Sea of Cortez 8 day / 7 night adventure
Loreto great circle. Best visibility and warmest water of the year. New trips posted because of heavy demand.
* Bookings prior to may 15, 2024More info -
Early booking discount Jan. trips
Gray whales of San Ignacio Lagoon
4 days / 3 night.
This is the most extraordinary whale interaction on the planet!
Fly-in. Glamping accommodationMore info -
Bait Ball Season
Dive Socorro Island in June
We love diving Socorro, especially in the spring and early summer. Socorro is always stunning, raw, and primal, offering fantastic diving experiences known for the super-friendly and interactive giant mantas.
More info
Your Home at sea
Our liveaboard diving ships were constructed with careful consideration. Relentless and obsessive attention to safety has been a cornerstone of our business from our very early days in the 1980’s.
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Nautilus Explorer
Canadian built
132 feet long
SOLAS safety certified
Tour Ship -
Nautilus Belle Amie
Launched in 2015
147 feet long
Ultra-quiet
Tour Ship -
Nautilus UnderSea
105 feet long
Full-width superstructure
Enclosed dive deck
Tour Ship -
Nautilus Gallant Lady
116 feet long
6 large suites
1,700 horsepower
Tour Ship
We go above and beyond
Excellence in guest experience is all about you. Our focus is to ensure that you as our guest are safe and able to enjoy your vacation to the highest level.
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“A simple way to sum my experience: a trip of a lifetime.”
Jack, 27 September 2024“A simple way to sum my experience up would be simply put: a trip of a lifetime. I feel so incredibly grateful to be in a position where I am able to explore such a beautiful part of the world. To experience it all with world class service has truly been a gift. I have […] -
Thousands of schooling hammerheads at Cocos Island.
Mark, Manoush, 31 August 2024“Today we got the chance to dive Dirty Rock a second time, after the epic dive we had there on the 2nd day of our Cocos trip. The cleaning station was fully in action and we got plenty of great close encounters with the hammerheads. In addition, there was barely any current so when our […] -
Extraordinary Orcas and Mobulas trip!
Chelsea Meier, 12 July 2024Throughout my time on board the Gallant Lady it has been extraordinary! Every day was filled with new wildlife to see and adventures. What really made it special was the kindness from the crew and the delicious food. Today we woke up to hear that there was a school of mobula rays around and we […] -
40 minutes of interaction with giant mantas, sharks, and dolphins!
Rogelio Dominguez, 1 July 2024There is no words to describe the glorious expedition with our guide Emilio at Socorro Isla. First he made sure everyone was well prepared and assured everyone in the group had a good understanding of the plan. Then he took us to a spot were we had over 40 minutes of interaction with multiple giant […] -
Orcas everyday!!!
Kateryna, 15 June 2024An amazing experience observing and diving with mobulas and ORCAS!!! Out of 5-day trip, we were able to see orcas every day. They swam past us while we were diving and snorkelling! Such a unique experience seeing these whales few meters away from you, sometimes looking like you could almost touch them. Crew members were […]
Our values and culture
Safety First, Always
Our culture of relentless and obsessive attention to safety has been a cornerstone of our business from our early days operating in the 1980’s.
It’s all
about YOU
Our focus is to ensure that you as our guest are safe and able to enjoy your vacation to the highest level. A happy crew makes for a happy ship and the very best in guest experience.
The best of
the best
Our ships are crewed by teams of extremely hard-working men and women from around the world who love the ocean just as much as you do.
Blogs
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October 6th, 2024
An incredible first day in the Sea of Cortez
Upon arriving from a long bus ride from Cabo San Lucas to La Paz, we were greeted by the crew of Under Sea at the dock and transported in their RIB (Rigid Inflatable Boat) to the mother ship, it was already dark and we could not yet appreciate our surroundings. We were greeted onboard by […]
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October 3rd, 2024
A perfect day aboard the Gallant Lady
“We had a great day of diving on Day 2 of the Sea of Cortez adventure! Our first dive at Las Animas we saw a school of 20+ hammerheads, sea lions, and a super active octopus on the reef! We continued diving around the area, seeing hammerheads on 3 out of 4 dives along with […]
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October 2nd, 2024
Playful sea lion pups in the Sea of Cortez!
“Floating slowly along with the current, looking for tiny creatures in the coral, suddenly a large body zooms past the side of your mask: it is one of several playful sea lion pups coming to investigate the other large mammals blowing bubbles near their rookery. Curious and unafraid, they dive, pirouette and change direction in […]
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September 11th, 2024
2024 Mobulas & Orcas Season
We had a terrific 2024 mobulas and orca season. We now believe there are at least 3 pods of orcas that are resident year-round in the Sea of Cortez. Not just around La Ventana, but further north as well. In fact, we saw one pod feeding off loreto just yesterday, Sept 10 and then again this […]
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September 10th, 2024
Sneak Peek Into 2024 Mexico Sardine Run
The animals of the Mexico Sardine Run are really something—REALLY SOMETHING! How do you describe a giant bryde’s whale appearing 20 to 30 feet away in indigo blue water, gulping its way through poor frightened sardines! Or the sight of super-fast marlin streaking their way around you. Or as happened last December, humpback whale mommas […]
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September 5th, 2024
“The Ultimate Whale Shark Adventure is a trip of a lifetime.”
“The Ultimate Whale Shark adventure in the Sea of Cortez is a trip of a lifetime. The diving is amazing with a lot of sea lion action with a good mixture of some of the most beautiful reefs I have ever seen. Then comes the highlight, the whale sharks. You have plenty of opportunity to […]