Caribbean & Atlantic
The site itself, where it sits, and what to know before you plan a snorkel around it. We describe it accurately — access and conditions are verified locally, on the day.
A blue-lit underwater cave with a domed opening you can swim through — the film set for a Bond underwater scene, thick with fish and shimmering shafts of light. A quintessential snorkel stop.
This is one of the key sites on Bahamas, which sits at #16 on our ranked catalog. Sandy flats, blue holes and the Exumas' shallow crystal sea.
Pair it with Staniel Cay & the surrounding cays — small cays ringed by shallow reefs, grass flats and the occasional coral head, with stingrays, turtles and reef fish in water you can see to the bottom. Thunderball sits near Staniel Cay in the Exumas and is a boat stop, so plan it as part of a day on the water rather than a shore entry.
Verify access locally and confirm with your guide on the day.
Planning a snorkel at Thunderball Grotto?
Get the whole journey assembled — boat days, gear and day-by-day timing notes, with flights and stays linked through our booking partners — by the Double Fathom Concierge for a one-time $29. Re-plan any time, chat support through the trip, a destination-specific packing list, curated off-menu operators, and a printable offline itinerary PDF.
Secure checkout by Stripe — pay by card, receipt by email. A one-time, per-trip purchase — nothing recurring, and no rush either way.