Formerly the Undersea Hunter of Cocos Island and IMAX fame, the Nautilus UnderSea is one of the most beloved live aboard dive boats in the world. The UnderSea first entered service in 1968 as the personal submarine tender to Dr. Perry of Perry Oceanographic.

This sturdy and brave ship became one of the most famous dive boats in the world as the Undersea Hunter voyaging out to Cocos Island and in IMAX adventures around the South Pacific.

The special feature of the UnderSea is the intimate group size combined with Nautilus spaciousness and comfort and a huge dive deck and water level platform. It is important to note that the ship was launched in 1968 and she is not as new and contemporary as our other ships.

We graced the ship with a massive shipyard refit including: stretching the hull, a new superstructure and extended sun deck, a bulbous bow and stability system. With massive upgrades it is hard to recognize the original ship.

Sun Deck
Sun loungers, al fresco lounge, bar, hot tub and premium suite.

Main Deck
Main lounge and dining room, dive deck, water level platform, ADA compatible stateroom, and triple stateroom.

Lower Deck
6 staterooms on the lower deck.

The UnderSea may look different these days, but she still has the same heart and spirit that made her a diving legend.

Our ships are crewed by a wonderful team of extremely hard-working men and women from around the world who love the ocean just as much as you do. We are very proud of our staff and crew, and remain constantly impressed by everyone’s dedication to our guests, and how hard everyone works to maintain the highest possible standards.