Nautilus UnderSea

The Nautilus UnderSea is a 105-foot (32-meter) liveaboard steeped in history. First launched in 1968 as Dr. Perry’s personal submarine tender for Perry Oceanographic, the vessel later rose to prominence as the Undersea Hunter, conducting expeditions to Cocos Island and featuring in IMAX documentaries filmed throughout the South Pacific. A major refit in 2017 transformed the vessel, adding a hull extension, a new superstructure, an expanded sun deck, a bulbous bow, and a state-of-the-art stabilization system—blending its classic legacy with modern performance and comfort.

Facilities & Meals

Accommodating up to 19 guests, the Nautilus UnderSea is designed for intimate, small-group diving adventures. It features a spacious dive deck with a water-level platform for easy access, plus an extended sun deck and a hot tub for post-dive relaxation. Meals are freshly prepared daily and reflect a mix of international flavors, ensuring variety and satisfaction for every palate.

Activities

In addition to world-class diving, guests can unwind in the hot tub or relax in cozy lounge areas. Evening presentations and marine life slide shows add an educational touch to the experience, deepening your appreciation for the underwater world.

Staying Connected

The Nautilus UnderSea offers satellite Wi-Fi to help you stay connected while at sea—ideal for keeping in touch with loved ones or handling light work. A satellite phone service is also available for additional communication options.

We Think. . .

Combining rich maritime history with thoughtful modern upgrades, the Nautilus UnderSea delivers a unique and comfortable liveaboard diving experience. With its personal atmosphere, exceptional crew, and access to some of the Pacific’s best dive sites, it’s an ideal choice for divers seeking both adventure and luxury.

The Nautilus UnderSea explores the eastern Pacific, with a primary focus on dive expeditions to the Socorro Islands. These remote volcanic isles are known for their dramatic underwater topography and exceptional biodiversity, offering thrilling encounters with pelagics and megafauna.

How to Get There

Guests usually arrive via Los Cabos International Airport (SJD) in Mexico, where the Nautilus team arranges seamless transfers to the vessel’s departure point, ensuring a smooth and stress-free beginning to the adventure.

Premium Suite

• Emerald Suite: Located on the sun deck, this generously sized suite can be configured with either two full beds or one large bed. It offers multiple windows, a flat-screen TV, an ensuite bathroom, plenty of storage, individually controlled air-conditioning, and convenient access to the hot tub.

ADA-Compatible Stateroom

• Rosario Suite: Located near the dive deck, this wheelchair-accessible cabin includes twin beds, a large window, an ensuite bathroom with private shower, and individually controlled air conditioning.

Staterooms

• Six Lower Deck Staterooms (A–F): Each room offers upper and lower bunk beds, ensuite bathrooms with private showers, and adjustable air conditioning. Bed configurations vary between staterooms.

Triple Stateroom

• Main Deck Triple Stateroom: Designed for value and flexibility, this cabin includes two bunk beds (one with added storage), an ensuite bathroom, private shower, and air conditioning. Note: This room offers a more compact layout.

En Suite Bathrooms

Diving Location Features

The Nautilus UnderSea grants access to some of the most thrilling dive sites in the eastern Pacific. Divers can expect encounters with giant Pacific mantas, hammerhead and whale sharks, dolphins, and an abundance of other pelagic species within vibrant ecosystems.

Dive Services

Divers enjoy a spacious dive deck complete with a large water-level entry platform, individual gear storage, rinse tanks, and a dedicated camera table for photographers. Nitrox is available, and the vessel supports rebreathers. All dives are led by experienced guides to ensure safety and enrich the dive experience.

Dive Sites

• Baja Ultimate Whales (Jan–Apr): Combines swimming with whale sharks, snorkeling with sea lions, a 3-night expedition in the Sea of Cortez, and sightings of humpbacks, blue whales, and dolphins. Topped off with a private flight to San Ignacio Lagoon for unforgettable gray whale interactions.
• Orcas in the Sea of Cortez (Apr–Aug): Encounters with multiple pods of orcas that actively choose to interact, with peak sightings in July and August.
• Ultimate Whale Shark Adventure (Jun–Oct): Swim with whale sharks in a pristine bay of the Sea of Cortez. Chance encounters with orcas, finbacks, and sperm whales add to the excitement.
• Sea of Cortez (Jul–Nov): Diverse year-round marine life with mega pods of dolphins, mobula rays, visiting orcas, and superb summer/fall diving with warm water and great visibility.
• Loreto / La Paz (Jul–Nov): A relaxed diving itinerary across calm seas with up to 4 dives daily, playful sea lions, and chances to see orcas, pilot whales, and sperm whales. Includes beach walks, kayaking, and desert excursions.
• Mexico Sardine Run (Oct–Dec): Intense pelagic action as the Pacific explodes with life during the sardine run, featuring snorkeling and freediving supported by liveaboard and panga boats.

Live Availability and Pricing

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Nautilus Under Sea Extras Payable Locally