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Catalina Island Undersea Expedition

Avalon, United States

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Free Cancellation
up to 24 hours in advance
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icon45 minutes  (Approx.)
Mobile ticket
iconOffered in: English
Good for avoiding crowds


See what lives in the Pacific waters surrounding Catalina Island on a 45-minute underwater cruise. As you sit comfortably in a climate-controlled cabin on board a large boat, you'll glide five feet (1.5 meters) below the surface to look for marine life in their natural habitat out of your own porthole. Along the way, listen to live commentary from a guide.
  • 45-minute undersea tour from Avalon
  • See the underwater world of Catalina Island without getting wet
  • Learn about the Pacific Ocean marine life from a guide on board
  • Choice of departure times available throughout the day
Saved to wishlist!
Live commentary on board

Departure Point

1 Green Pleasure Pier, Avalon, CA 90704, USA

Return Details

Returns to original departure point
Your undersea expedition starts at Green Pleasure Pier in Avalon, where you'll hop aboard the semi-submersible vessel and journey below the waterline for a look at the underwater world of Catalina Island.

Every passenger has his or her own seat and porthole, but you are also free to walk around the cabin for other viewpoints. Look for fish and other Pacific marine life as your deckhand-guide provides narration about the environment and points of interest. On the way back to the harbor, you may go up on deck to admire views of Avalon before docking.
Pass By:  
Catalina Expeditions Tours
Pass By:  
Catalina Island Company
  • Confirmation will be received at time of booking
  • Most travelers can participate
  • Not wheelchair accessible
  • Restrooms are not available while on tour, but are available at the base of the Green Pleasure Pier, so please use before check-in
  • Your tour is not confirmed with the local operator until you call the number located on your voucher to provide your voucher information and schedule your tour time. See voucher for details
  • This tour/activity will have a maximum of 12 travelers
  • OPERATED BY Santa Catalina Island Company

For a full refund, cancel at least 24 hours in advance of the start date of the experience.

  • This experience requires good weather. If it’s canceled due to poor weather, you’ll be offered a different date or a full refund.

Learn more about cancellations.

The answers provided below are based on answers previously given by the tour provider to customers’ questions.
What is the maximum group size during Catalina Island Undersea Expedition?
This activity will have a maximum of 12 travelers.

See all safety measures taken by Catalina Island Undersea Expedition.

Traveler Photos


27 Reviews
2 stars
Reviews by Viator travelers
Showing 1-10 of 27 reviews
Excellent ecotourism
, Nov 2020
Such a unique experience to see the ocean below! Great commentary from crew to educate guests on the type of fish and surroundings in Catalina. Definitely recommend!
All that is under the water?
, Jan 2020
Dress for the weather. We saw so much under the water. Expected the fish, but their environment put me in awe. Great having children on the tour. They were so excited by the different fish. "That being said," I recommend this trip.
Expedition oversold, and we were bumped!
, Dec 2019
We made reservations and paid for the Undersea Expedition over two months ago. A couple of weeks prior to the trip, I received a call that we would need to change the time of the reservation due to a "scheduling conflict." No worries...we were able to secure a time that would work within our itinerary. When we boarded the vessel, there were no seats left and we had to leave the vessel. There were no more expeditions scheduled for that day and we were leaving the following morning. While staff were as helpful and sympathetic as they could be, the expedition was oversold by some other booking entity (not Viator) to accommodate a cruise ship full of travelers. We were not able to do this activity, which was the one we were really looking forward to. Viator was very helpful, and we got a full refund, but I had to do all of the leg work to make that happen.
HelpfulHelpful1 traveler found this review helpful
Great Excursion to see Fish.
Derrill H
, Jul 2018
Great Excursion to see Fish and underwater scenery. The captain was very informative and upfront. I would recommend to anyone who has never been before and especially those with kids.
This was fun for our whole family...
Ann A
, Apr 2018
This was fun for our whole family. We had 3 generations and each person said how much fun it was. There were many fish to see and the staff were very helpful. We recommend this to any other family.
The tour itself was exactly as...
Katherine R
, Mar 2018
The tour itself was exactly as expected. They even refunded the tickets for two in our party when they got sick right before boarding. The tour operator needs a better sign to identify which tour booth belongs to them. We finally just has to stop and ask at one of the tour booths to be directed to the correct one.
Great activity for the whole family...
Rhia H
, Jul 2017
Great activity for the whole family. Crew were competent and friendly. Being able to see the fish feed through the big glass windows was enjoyable for all ages. Being a nature adventure, what you will see is whatever is out there --- no guarantees. However, if you keep your eyes open and stay alert, you will see and observe a lot.
Had the time of my life there, the...
anna r
, Sep 2016
Had the time of my life there, the people are friendly and there is a lot to do there.
Great mini-excursion, especially with...
, May 2016
Great mini-excursion, especially with small children.
The phone number that iator has...
Noel C
, Apr 2016
The phone number that iator has posted on their reservatio ninstructiosn to call and reserve your seats is incorrect and disconnected. Started out bumpy but I was able to go online and find another number to reserve seats, but this should be updated! :

Product code: 13327P6

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