Big Fish Diving has built its reputation on Gili Trawangan by chasing pelagic action since 2009. The center specialises in guiding confident divers to the islands' deeper walls and current-swept sites, with Advanced, Rescue, Divemaster and Deep specialty training to match.

Regular trips hit Deep Turbo, Shark Point, Simons Reef and the Bounty Wreck, hunting sharks, rays and open-water encounters. Beginner courses run too, but advanced divers are the core crowd. Teaching runs in English and Indonesian, and the center holds a 4.7 Google rating from more than 240 reviews.