Two scuba divers exploring a rocky reef with bubbles rising toward the sunlit surface off the Guanacaste coast, Costa Rica

PADI 5★ Dive Center · Playa Potrero, Costa Rica

Explore the Pacific's Best Dive Sites

The Best Scuba Diving in Costa Rica

Experience the best scuba diving in Guanacaste Costa Rica, with Under The Sea Diving. From your first breath underwater to bull sharks at the Bat Islands and manta rays at the Catalinas, our multilingual PADI instructors make every dive safe, relaxed, and unforgettable.

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Diving in Guanacaste, Costa Rica

Scuba Diving Tours, Courses & Conservation in Guanacaste

Experience the best scuba diving in Costa Rica with Under The Sea Diving, your PADI dive center in Playa Potrero. From your first breath underwater to advanced technical certifications, we offer the full range of diving in Guanacaste — guided scuba tours to the Catalina and Bat Islands, PADI courses from Open Water to Divemaster, hands-on marine conservation dives, and technical specialties for every level. Whether it's your first dive or your five-hundredth, the Pacific's vibrant underwater world starts here.

Scuba diver silhouetted against sunlight while descending in deep blue water off Playa Potrero, Costa Rica

Scuba Diving Tours Explore Guanacaste's world-class dive sites at the Catalina and Bat Islands, where manta rays, sea turtles, schooling fish, and bull sharks fill the nutrient-rich Pacific waters. From Discover Scuba first-timers to certified fun dives, shark dives, and night dives, our local guides handle every detail so you can focus on the thrill.

Group of smiling scuba students in dive gear aboard the boat before a course dive in Guanacaste, Costa Rica

PADI Dive Courses Get certified in the clear waters of Guanacaste, from your first Discover Scuba experience to PADI Open Water, Advanced, Rescue, and Master Scuba Diver. Learn at your own pace with e-learning and hands-on dives at the Catalina Islands, guided by professional PADI instructors dedicated to your safety.

Scuba diver removing tangled ghost fishing line during a marine conservation dive in Guanacaste, Costa Rica

Marine Conservation Diving Turn your passion for diving into a force for good with hands-on programs — Shark Conservation, AWARE Coral Reef, Dive Against Debris, and Underwater Naturalist specialties. Help protect Guanacaste's Pacific ecosystems and the sharks, manta rays, and coral reefs that call these waters home.

Technical diver gliding over a coral reef with a diver propulsion vehicle (DPV) in Guanacaste, Costa Rica

Technical Scuba Diving Go beyond recreational limits with technical training built for Guanacaste's volcanic pinnacles, arches, and deep sites at the Bat and Catalina Islands. Master Nitrox, Deep, Sidemount, Wreck, and DPV specialties to safely explore the depths where bull sharks, giant manta rays, and big pelagics roam.

Explore Costa Rica's Pacific Dive Sites

From the Catalina Islands to the legendary Bat Islands, the waters off Guanacaste hold some of Costa Rica's most thrilling dives — manta rays, bull sharks, and big-animal encounters in the warm Pacific. Here's where we'll take you.

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Dive the Guanacaste Highlights

Diver with a manta ray at the Catalina Islands, Guanacaste, Costa Rica

Catalina Islands Manta rays, mobulas, and schooling fish over volcanic pinnacles — the Catalinas are Guanacaste's go-to for graceful big-animal encounters.

Bull shark diving at the Bat Islands in Guanacaste, Costa Rica

Bat Islands (Islas Murciélago) The legendary home of the bull sharks. An advanced, adrenaline-charged dive at one of Costa Rica's most famous sites.

From the Dive Log

The Dive Report

Local dive conditions, marine life spotlights, and tips from the crew — your guide to scuba diving in Guanacaste, straight from the water.

Read the Dive Log

October Dive Report | 20% Off PADI Courses in Guanacaste

01.10.2026

News & Updates October is here! Thanks to our amazing dive community for another season of incredible dives, support for the crew,…

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September Dive Report | Beach Cleanups & Ocean Conservation in Guanacaste

03.09.2026

September Dive Report | Beach Cleanups & Ocean Conservation in Guanacaste September is here! Thank you to our incredible dive community for…

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August Dive Deals & Humpback Season

07.08.2026

August Dive Deals & Humpback Season August is here, and it’s one of the best months of the year to be in…

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Trusted by Divers Worldwide

What Our Clients Say About Dive Tours in Costa Rica

Divers from around the world trust Under The Sea Diving for safe, unforgettable diving in Guanacaste — here's what they have to say.

      
   Under the Sea Diving | Playa Potrero Dive Center
   307 Google reviews 
  Write a review 
  
 
 
   
 
 
       Posted on Google  
   
   Eric bantz 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great crew. Attention to detail is impeccable.
Truly alot of fun .
  
 
      Posted on Google  
   
   Laura Souder 
 
 
 
 Trustindex verifies that the original source of the review is Google. Wonderful experience. Great crew, great boat, great diving. Can't wait to go again!
  
 
      Posted on Google  
   
   Fernando Lopez 
 
 
 
 Trustindex verifies that the original source of the review is Google. My son and I got our PADI certification here and we had an awesome experience. It was super easy to communicate with Hannah and the office team, Jose was an awesome instructor and the boat crew was also super nice. We learned a bunch and enjoyed the dives in Catalina Islands. Would highly recommend.
  
 
      Posted on Google  
   
   Property Finder Marbella 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great dive centre. Spanish and English speaking. Friendly, professional and highly recommended.
  
 
      Posted on Google  
   
   E da 
 
 
 
 Trustindex verifies that the original source of the review is Google. Nos 4 adolescents ont passé leur PADI grâce à Under the sea! Super encadrement pro et charmant! Plongée magique! Ce fut fabuleux!
  
 
      Posted on Google  
   
   Jon Moma 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent dive shop! All the staff were super friendly, professional, and knowledgeable! We would love to come back and dive again with Under The Sea!
  
 
      Posted on Google  
   
   wwgrabow 
 
 
 
 Trustindex verifies that the original source of the review is Google. Wonderful crew and support provided for our family of four. Very knowledgeable and easy to work with in terms of booking and communication. Shout out to our guide Jose who made sure that we had a safe and fun experience.
  
 
      Posted on Google  
   
   magali ruffier 
 
 
 
 Trustindex verifies that the original source of the review is Google. super good diving center, organisation and staff very good. Bit deasapointed as not a lot of corals, but some sharks. The only star I removed is about the pictures they sell on the boat for additionnal 20$ and which have a very bad quality...better not proposition maybe.
  
 
      Posted on Google  
   
   Claudia Torres 
 
 
 
 Trustindex verifies that the original source of the review is Google. Fue todo un placer hacer una inmersión con vosotros!
Todo funcionó de maravilla, súper organizado, puntual y efectivo.
Especial gracias a nuestra divemaster Jessica que desde el primer momento fue súper amable con nosotros, nos explicó todo lo que íbamos a hacer, que íbamos a ver y estuvo muy atenta en todo momento, un placer!! Lo pasamos genial, repetiríamos sin duda.
  
 
      Posted on Google  
   
   Benoit Cappronnier 
 
 
 
 Trustindex verifies that the original source of the review is Google. Très bonne expérience pour deux jours de plongée. Le personnel est très sympathique et professionnel, les sites de plongée sont très bons et le service impeccable. Je recommande vivement si vous souhaitez plonger dans la région. Nous avons eu la chance de voir des raies manta et des bull sharks. Notre divemaster Josue était aux petits soins pour nous. Nous reviendrons
  
 
  
  
 
    Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

Our Partners & Sponsors

Under The Sea Diving is featured in KAYAK's travel guide for Playa Potrero. Planning your Guanacaste trip? Check out their guide for flights, stays, and things to do — then come dive with us.

KAYAK

Under The Sea Diving is the only Shearwater Research dealer in Northern Costa Rica, offering the dive computers trusted by recreational and technical divers worldwide.

SHEARWATER

Dive confidently knowing that you have the world's leading dive safety organization on your side.

VISIT DAN

We are authorized distributors of Cressi.

VISIT CRESSI

Ready for the Best Scuba Diving in Costa Rica?

From thrilling dive tours to professional PADI certification, our team is ready to help you plan the perfect adventure in Guanacaste — whether it's your first dive or your five-hundredth.