Amberjack Hole, Blue hole in Gulf of Mexico, US.

Amberjack Hole is a blue hole in the Gulf of Mexico off Florida's coast, extending from about 34 meters depth to 72 meters where the seafloor drops away sharply. The formation was created through water chemistry interactions and creates a distinctive circular depression on the ocean bottom.

The structure formed thousands of years ago through limestone dissolution where saltwater and freshwater from the Floridan aquifer came into contact. Modern scientific study of the site began in 2019 to understand its geological makeup and water interactions.

Marine researchers gather data about water composition, sediments, and ecological interactions between species inhabiting different depth levels of the formation.

Visiting requires technical diving certification and specialized equipment since the site is roughly 48 kilometers from Florida's coast. The dive should only be attempted by experienced divers who are properly trained for deep water conditions and remote locations.

The hole contains specific isotopes of radium and radon that prove a direct link between the Floridan aquifer and the depths below. This chemical signature allows scientists to trace underground water pathways and understand how freshwater moves through the geological layers.