Thunderball Grotto is a small cave on an island near Staniel Cay. It is a wonderful place to snorkel at slack tide. The current rips through here, so going at slack tide is a must. We like going at slack low. As you will see even at low tide there isn't much room between your head and the jagged rocks that come down. At high tide, you would have to swim down under the water to get below the rocks and go through the opening~ Not something I want to do! There are beautiful corals and fish both inside and outside the grotto. It is fun to swim through the grotto and around the island. If the tide starts to pick up even a little, it is a quick drift dive giving you the desire to do it multiple times. A few crazy folks decided to climb up the rock to the top and then jump through the hole at the top which is only a few feet across. For all you James Bond fans, yes, this is the place where they pulled 007 up through the hole in the top with a helicopter in the movie Thunderball.