This dive site, known as "The Big Scare" or "Gran Susto," is a renowned location within the Murcielago Archipelago (Bat Islands), which forms part of Costa Rica's Santa Rosa National Park. It is globally recognized as one of the premier destinations for encountering bull sharks. While no specific historical accounts or detailed navigation routes are provided, its evocative name "The Big Scare" aptly captures the thrilling and intense nature of its famed shark encounters, occurring at depths that require advanced diving skills.
This dive site is an unparalleled hotspot for large pelagic marine life, with bull sharks being the undeniable main attraction, especially between April and November. Beyond these formidable predators, divers frequently encounter different species of rays, including majestic oceanic mantas gracefully gliding through the waters. As a vital component of the protected Santa Rosa National Park marine area, the site supports a rich diversity of other marine organisms, though specific coral types or smaller reef fish are not the primary focus.
The prime season for experiencing the iconic bull shark aggregations at The Big Scare runs from April through November. Due to the maximum depth of 25 meters and the powerful marine encounters, this site is strictly recommended for advanced certified scuba divers. While freediving is technically possible for experienced breath-hold divers, the full scope of the "Big Scare" experience, particularly observing the deeper shark activity, is best enjoyed with scuba equipment. Divers should be prepared for potentially strong currents often associated with such pelagic-rich environments and always dive with experienced local guides.
