Today marks the last day of the rainy season here in Costa Rica. The sky was a brilliant blue and there wasn’t a cloud in sight; a nice change from the miserable weather we have had the past few days.
We were zombies when the alarm went off at 5 AM. It was an early morning for Joey and me as we assembled our regulators, masks and dive watches. We had gone to bed early the previous night in the hopes of being fully rested for our dive, but the mischievous coatimundi living in the condo roof had other plans.
Joey and I had been looking forward to this day all week. It would be our first dive together this year. We met our divemaster Carlos and a group of 5 at the Summer Salt dive shop. After the small but necessary preparations, we headed for the beach hitting the water at 6:30 sharp for the hour and a half boat ride to the dive site.
Our site of interest for the day was the Bat Islands or Islas Murcielagos, a chain of islands located off the tip of Santa Rosa National Park. This marine protected park requires divers to have an advanced open water certification or higher due to its strong currents and rough surface conditions. Amongst the aquatic life that call this place home, the big draw to the Bat Island site is the opportunity for an up close and personal encounter with the bull sharks that rule these waters. Joey had never dove with a shark before and I was really hoping we would get to see one of these beauties.
The captain steered the small vessel northward, away from the blackened mainland, leaving seagulls and white chop in our wake. With the salty Pacific sea air and rich blue skies above us, nothing was standing between us and the Bat Islands, well almost nothing. Of all the things that could go wrong, we didn’t expect it to come while making our way to the dive site.
Joey and I arrived at the Big Scare dive site with our heads hung over the side of the boat sick to our stomachs. We had been taking turns between puking and preparing dive gear for almost the entire duration of the boat ride. Between the two of us, all we wanted to do was get off of the topsy-turvy zodiac boat and into the cold soothing water.
While preparing for the dive, we were surprised when a whale blow spouted less the 50 meters from the idling boat. The entire boat turned to see the jet black dorsal of an orca sink beneath the water. Keeping our eyes alert, we watched as the orca circled and hunted in the spot where we would soon be diving. We glimpsed it’s dorsal a few times before it disappeared into the depths for good. Unfortunately, orca’s are one of the top predators of the ocean food chain. Because of this, they have a tendency to scare most marine life from the vicinity of their hunting grounds.
Following the orca sighting, we were told, by our divemaster, that there was a slim chance that we would see much at this site given its recent visitor. But, all the same, it was exhilarating to think that we would be diving and have an orca watching us from just out of sight.
It was surprisingly peaceful underwater given the surface conditions and Joey and I were very grateful. The only place we could find some relief from our sea sickness was deeper than 5 feet. The bottom of the site was very rocky and made up of mostly lava stone encrusted with coralline algae. I was the first to spot a small octopus carefully concealed between two rocks. I grabbed Joey’s attention so we could get closer and check out our first wild octopus sighting.
We saw a few marine odds and ends while swimming around at 90 feet but realized pretty quickly that the divemaster was right, we wouldn’t be seeing much.
Sea stars, small reef fish and morays made up the bulk of our finds and we had a great time capturing up-close footage. Without realizing it Joey’s hand came really close to a big morays eerie smile while getting tossed around by some bottom current. That would have been a nasty bite!
We dove the Big Scare dive site twice in the hopes that we would get some bull shark action, but sadly none came out to play. I think my face speaks words to how bummed out we felt!
The last dive site of our trip was called Black Rock, and it was hands down the best dive of the day although I’m sure we would have felt differently had we seen a bull shark.
By dive number three we had pretty much puked everything in our stomachs up. We were slightly dehydrated and very hungry but refrained from consuming anything. The fear of giving our seasickness more ammunition outweighed our desire to eat anything.
Eager to get below water, our divemaster gave us a quick briefing on the relatively shallow site before allowing us to hop in. We descended 60 feet into the wavy water intending to spiral around Black Rock while making our way to the surface. This marine-rich spot had so much more to see than the previous dive site.
Almost as soon as I put my face in the water I could see a flurry of activity in the waters below. Off in the distance, we spotted some eagle rays flying through the open ocean. Our divemaster rapped frantically on his tank – CLANG, CLANG, CLANG – to get the groups attention.
The rays majestically weaved in and out of our field of sight, their speckled bodies a stark contrast of the blue water. The shiver of elasmobranchs followed us for the greater part of the dive but kept a safe distance from our group of divers.
Towards the end of our Black Rock dive, nature had another treat in store us.
Out of nowhere a gigantic school of fish enveloped us. Thousands upon thousands of chere-chere grunt (Haemulon steindachneri) swarmed the waters around our group feeding and floating in the productive upwelling waters around Black Rock. I could not help but feel like I was living in an episode of Blue Planet, the massive wall of fish dancing so close we could almost touch them.
As much as we would have loved to stay underwater watching the school of grunts for hours on end, the air in our tank allowed us to enjoy this amazing sight for 15 minutes before heading up to do our safety stop.
On the way back to Playa del Coco the ocean had calmed down and Joey was able to sleep off some of his seasickness. We were really happy to get on firm land after a day at sea and it took us an entire evening to rehydrate and soothe our upset stomachs.
Underwater Bat Islands was our first dive in the Pacific Ocean and as with every first – you never know what to expect.
Due to the ring of fire geological location, the marine landscape of Bat was nothing special. The topography was lots of black volcanic rocks coupled with a sandy bottom.
What made up for the otherwise barren landscape was the terrific amounts of fish. Spadefish, grunts, jacks… Time and time again we found ourselves meeting new species of large fish, some in large schools that would fearlessly encircle us.
When you’re having a terrible dive day, it’s easy to overlook the beauty of a particular location. But looking back, misadventures aside, we had a rockin’ time underwater and if we ever make it back to the Pacific side of Costa Rica we will definitely retry our luck at diving with some big bad bull sharks.
Have you ever gone into a dive with high hopes of seeing some megafauna and been let down? Tell us more.
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Wow, what an adventure! Your detailed account of diving at the Bat Islands in Costa Rica is captivating. From battling seasickness to encountering unexpected marine life like orcas and eagle rays, it sounds like each dive brought its own excitement and challenges. It’s clear you have a passion for diving and a knack for storytelling—I almost felt like I was right there with you, especially during the encounter with the school of grunts at Black Rock. Despite not spotting any bull sharks, your positive outlook and appreciation for the underwater world shine through. Thanks for sharing your incredible diving experience!