Costa Rica
Islas Murciélago
Descend into dark Pacific water where bull sharks circle — their territory, your privilege.
The water darkens as the boat reaches the drop-off. Forty-five minutes from Playas del Coco, the Bat Islands rise from Pacific swell — bare volcanic rock above, cold upwelling below. You descend into green-black water, equalise, and the first bull shark materialises from the murk at twelve metres, circling with the indifferent precision of something that owns this place entirely.
Islas Murciélago sits inside Santa Rosa National Park's marine protected area off Costa Rica's Guanacaste coast. Bull sharks aggregate here between May and November in concentrations documented by marine biologists from the Undersea Hunter research group since 2000. The island chain's nutrient-rich upwellings also draw Pacific manta rays with wingspans reaching 3.5 metres, which circle cleaning stations alongside the sharks — two apex species sharing the same water column. Dive operators are licensed, access is controlled, and the open-Pacific channel crossing frequently tests even experienced sea legs. This is not a casual dive site. It is one of the few places in the world where recreational divers reliably encounter bull sharks in open water.
Solo
Advanced divers seeking a bucket-list shark encounter will find Islas Murciélago delivers without the price tag or logistics of Isla del Coco. The adrenaline is immediate and the commute is forty-five minutes.
Friends
Few shared experiences match surfacing after a bull shark dive. The boat ride back to Playas del Coco — cold Imperiales, ceviche, and a retelling that gets bigger with each harbour bar — is part of the ritual.
- The Bat Islands are accessed by boat from Playas del Coco — the 45-minute channel crossing through open Pacific frequently tests sea legs.
- Bull sharks gather here between May and November in concentrations documented by marine biologists from the Undersea Hunter research group since 2000.
- The island chain sits inside Santa Rosa National Park's marine protected area — dive operators are licensed and access is controlled.
- Pacific manta rays with wingspans reaching 3.5 metres circle the cleaning stations alongside the sharks — two apex species sharing the same water column.
Playas del Coco runs the boats — refuel post-dive with whole red snapper at the harbour.
The bars along Coco's strip serve cheap Imperiales and fresh ceviche to salt-crusted divers.
Aliwal Shoal
South Africa
Ragged-tooth sharks hover in cathedral-sized caves beneath the surf — divers drop into their world uninvited.
Baengnyeongdo
South Korea
Towering quartzite sea cliffs standing guard on the western maritime border facing North Korea.
Weather Coast
Solomon Islands
No roads reach the southern coast — only canoes thread between waterfalls plunging into the sea.
Blue Corner
Palau
Hook into the reef and hang in the current while grey reef sharks circle below.
Chirripó National Park
Costa Rica
Costa Rica's rooftop at 3,820 metres — dawn reveals both the Pacific and Caribbean below.
Corcovado National Park
Costa Rica
National Geographic called it the most biologically intense place on Earth. They undersold it.
Barra del Colorado
Costa Rica
A roadless river delta where tarpon explode from chocolate-brown water and jaguars patrol the banks.
La Amistad International Park
Costa Rica
A binational wilderness so vast and unexplored that scientists still discover new species inside it.