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Catalina Island Undersea Expedition

star-4.569 Reviews
Avalon, United States
Catalina Island Undersea Expedition
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Free cancellation
Up to 24 hours in advance. Learn more
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Safety measures
icon45 minutes  (approx.)
Paper 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
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Live commentary on board
1 Green Pleasure Pier , 1 Green Pleasure Pier, Avalon, CA 90704, USA

Undersea Life

This activity will end right where it started.
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
  • 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
  • Please check your email through Viator for your confirmation number and tour information
  • Near public transportation
  • Infants must sit on laps
  • Most travelers can participate
  • This tour/activity will have a maximum of 12 travelers
  • OPERATED BY Santa Catalina Island Company
You can cancel up to 24 hours in advance of the experience for a full refund.
  • For a full refund, you must cancel at least 24 hours before the experience’s start time.
  • If you cancel less than 24 hours before the experience’s start time, the amount you paid will not be refunded.
  • Any changes made less than 24 hours before the experience’s start time will not be accepted.
  • Cut-off times are based on the experience’s local time.
  • 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 policy on face masks and attendee health during Catalina Island Undersea Expedition?
A:The policies on face masks and attendee health are:

  • Face masks required for travelers in public areas
  • Face masks required for guides in public areas
  • Face masks provided for travelers
See all safety measures taken by Catalina Island Undersea Expedition.
What is the policy on sanitization during Catalina Island Undersea Expedition?
A:The policies on sanitization are:

  • Hand sanitizer available to travelers and staff
  • Regularly sanitized high-traffic areas
  • Gear/equipment sanitized between use
  • Transportation vehicles regularly sanitized
See all safety measures taken by Catalina Island Undersea Expedition.
What is the social distancing policy during Catalina Island Undersea Expedition?
A:The policies on social distancing are:

  • Social distancing enforced throughout experience
  • Contactless payments for gratuities and add-ons
See all safety measures taken by Catalina Island Undersea Expedition.
What measures are being taken to ensure staff health & safety during Catalina Island Undersea Expedition?
A:The policies on staff health & safety are:

  • Guides required to regularly wash hands
  • Regular temperature checks for staff
  • Paid stay-at-home policy for staff with symptoms
See all safety measures taken by Catalina Island Undersea Expedition.

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69 Reviews

Reviews by Viator travelers

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Showing 1-10 of 69 reviews
Bad trip
, Jul 2022
The boat over there had an emergency and we turned around and went back to Newport and then back to Catalina. Took 3 hours and our day was wasted away.
Great experience LOVE IT!!
, Jul 2022
The tour was so fun. On the guide was funny. So glad I went, I will for sure be doing this again. Loved it
lots of fun
, Jun 2022
I had fun watching all the fish. The crew were friendly and knowledgeable. I would go again. The only issue I have is with this review. You have to add at least 100 characters before you can submit the review.
Traveling underwater with...
, May 2022
Traveling underwater with the school of fish and being able to identify the fish was a treat of an experience!
Great adventure - and not cold or wet
, May 2022
This was a great adventure. They fed the fish right beside the boat so you are guaranteed to see lots of fish. It was a great time.
A must see for a young family
, Feb 2022
If you have a child 8 and under, this is a must sea! We have done full submarine dives in the Carribean and this far surpassed anything we have ever seen! The kelp forests are magical, the underwater clarity amazing and the fish - SO many!!
Sub Submarine Fun
, Feb 2022
The expedition was really fun . Got to see some pretty awesome ocean life and history of Lovers Cove.
Even my teenager was...
, Nov 2021
Even my teenager was Impressed. There was plenty of viewing space in the windows. We enjoyed the narration.
The perfect voyage
, Oct 2021
The captains lounge was amazing!! So relaxing and very large. Wonderful views and we even saw dolphins!
Awesome adventure
, Oct 2021
Had a great time ,staff was very nice . my grandkids loved it and they saw tons of fish , would highly recommend it
What lives beneath
, Sep 2021
Saw the beauty of what lives beneath the ocean waves. Beautiful and informative. Thanks for a quick but fun and memorable trip.
A Wonderful Great time !!! , Don’t miss this tour when you go to the island !
, Sep 2021
So beautiful, Experienced a whole different world in the undersea , what the ocean has to offer . An awesome learning experience. The Boat is so cool 😎 and safe . the staff is so polite and pleasant
Worth it!
, Sep 2021
Love it! We saw plenty of fish and was given information about sea life and island that was interesting to hear and learn.
Save the fisg
, Aug 2021
We really enjoyed this beautiful tour! The fish were so calming to watch as we sailed by in our sub Our tour guide was so informative about the fish and their habits The highlight of the tour was the fish being fed ! I highly recommend this tour
Viator and company disappointing
, Aug 2021
We couldn’t get ferry tickets for the morning of activity. I emailed Viator 3 times and no response. Called and left 2 vm with number on ticket like instructions say. No one called back. Called again and got hung up in. So we couldn’t go after I paid. Details for activity doesn’t say you need to get a ferry way in advance. Upset I wasted that money and couldn’t go to the island.
Terrific tour!
, Aug 2021
Since they actually feed the fish, there are lots of them to view. Very interesting. experience. The crew members were knowledgeable, courteous and friendly. The tour left on time. I would recommend it.
, Aug 2021
Excellent crew! Time and money well spent. Being a non-swimmer and unable to snorkel it was a great excursion!
It’s a MUST!!!!
, Jul 2021
The Captain was super nice. He explained everything in great detail! Loved it! Worth every penny!!! You could see LOTS of fish. Great experience for everyone.
Great experience
, Jul 2021
I had a great experience with the people on the submarine. However the person operating the ticket booth was a little rude
Gotta Do It!
, Jul 2021
The Undersea Experience was so much fun. It was thrilling to be cruising through the protected kelp forest of Lover's Cove with so many and varied fish all around the windows below water - right in the schools of fish feeding and looking us directly in the eye through the window periodically. We also learned a great deal about the fish, the island, and the environment through Sean's expert explanations. Highly recommend it!

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