The Nautilus Semi-Submarine Excursion

Hop On The Yellow Semi-Submarine, The Best Submarine Tour On Catalina Island!

Semi Sub Catalina Adventure Tours

Custom Built Submarine Providing Amazing Underwater Tours Off Catalina Island.

Providing semi-submarine tours from Avalon, Catalina Island for over 30 years.  Catalina Adventure Tours provides many guests the opportunity to view marine life of all types without scuba diving.   Our yellow submarine named the “Nautilus” was custom built state of the art and includes large circular windows designed for viewing, spacious below cabin seating, and features a fish food feeding system launched by torpedo buttons so you can feed the fish from your seat (for an additional charge). This makes for the most amazing, up-close views of Catalina Island’s spectacular, colorful fish and local marine life. No aquarium can compare with this viewing in the wild.

Departing from the Green Pier in Avalon,  tours are offered several times a day and travel to Lover’s Cove marine preserve just outside of Avalon. Water clarity can reach 100 feet or more and this marine reserve is a no take zone allowing fish and other marine life to thrive and grow quite large. Seasonal evening tours are also offered for viewing nocturnal sea creatures active only after dark using our semi-sub’s custom lighting system to make the night turn into day!

Book now and board the submarine for an unforgettable adventure.

Things to Know:

Participants must be able to transfer to vessel (walk 12 steps down to and up from seating area)

For safety, you should be in good health and free from claustrophobia or anxiety symptoms, high blood pressure, motion sickness, or other conditions that could be aggravated by this adventure.

Late Policy

If you arrive late, we are not able to provide you with a refund. Our tours are scheduled to provide you with the best experience possible, and we are not able to make any exceptions if you are late. Please arrive 15 minutes early to ensure you are on time.

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