The sonar showed a slow and gradual slope of clean clay and rock from the hotel bank due south 270 meters where it showed 65 feet of water rising quickly to 25 feet on top of the island.
An H float and a more permanent water bottle mark the spot.
The island seems to be about 35 meters long, 12 meters wide and has a drop off of 40 feet on the north hotel side and 60 feet on the south.
Diving down to the sunken island in 26 feet of water a hard clean gravel top as expected