Board a boat from Tamarindo for a full-day, three-dive expedition to Bat Island (Isla Murciélago). Two deep dives target bull sharks at ~30 m while a third, shallower site offers reef life and possible manta encounters.
More ways to explore the area's outdoor wonders
The boat cuts loose from Tamarindo at dawn and the Pacific opens around you — a blue pull that feels both familiar and indifferent. By the time you spot Isla Murciélago (Bat Island), island cliffs rise dark against the horizon and the captain is already briefing: two deep dives here for bull sharks, one shallower site later with a chance at mantas. The water smells of salt and diesel; your regulator is your next conversation partner.
Difficulty
challenging
Duration
10–11 hours
Fitness Level
Strong cardiovascular fitness and good buoyancy control; comfortable with long dives and ladders in swell.
Wildlife
History
Isla Murciélago was named for local bat colonies and long served as a landmark for Guanacaste fishermen; its steep drop attracts large pelagics.
Conservation
Responsible operators enforce no-touch policies and recommend reef-safe sunscreen; minimizing chum and avoiding harassment helps protect shark behavior patterns.
Reserve your spot on the Bull shark experience today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring proof of advanced certification
You must be certified to 30 m/100 ft or purchase the deep-dive upgrade; guides will check cards before boarding.
Plan your travel after diving
Wait 18–24 hours between your last dive and any flight or altitude change to avoid decompression risk.
Manage equalization
Start equalizing early and often on descent; ear or sinus issues can prevent participation and are not refundable.
Prepare for boat motion and sun
Bring seasickness remedies and high-SPF, reef-safe sunscreen for long surface intervals on an open boat.
Dive computer
Tracks depth and no-deco limits for multi-dive safety on deep profiles.
Certification card and logbook
Operators require proof of deep-diving training and recent logged dives.
3–5 mm wetsuit or shorty
Thermal protection for long surface intervals; thickness depends on personal comfort.
winter
Reef-safe sunscreen and polarized sunglasses
Protects skin on deck and reduces glare during surface swims without harming marine life.