Interacting with some of the most charismatic animals on the planet!
Friendly giant mantas and dolphins, majestic orcas, blue whales with their calves, whale sharks, the most extraordinary interaction with gray whales, massive schools of hammerheads, tiger sharks and 10 other shark species, mega schools of mobula rays, curious California sea lions, and whirling tornadoes of fish. Majestic sperm, fin, and humpback whales. Showcasing the beauty of Baja Mexico and the tropical rainforests of Costa Rica.
There is much to explore, dream, and discover!
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
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Nautilus Belle Amie
Launched in 2015
147 feet long
Ultra-quiet
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Nautilus UnderSea
105 feet long
Full-width superstructure
Enclosed dive deck
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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.
Blogs
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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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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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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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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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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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“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 […]
