Angelfish Blue Hole is a strongly tidal marine cave. It is entered through a submerged sinkhole at 9 m depth in an enclosed bay. Most of the passages are lens based and situated in 28 to 30 m depths. These passages have a keyhole morphology indicating both phreatic and vadose history. Two deep pits are located at opposite ends of the cave and extend from 23 m depths to more than 60 m. These pits intersect with a fault line cave system running north to south beneath Stocking Island. Numerous lens based passages leading west contain a number of small grottos that are highly decorated with abundant stalactites, stalagmites, columns and rimstone dams.