Hol Chan channel, a 30
ft deep hole roughly a hundred yard circle, in the Barrier Reef was first put on the Scuba Diving map by Dick Moore in his old navy boat that he bought second hand up in Key West.
He sounded its depths and recovered one of the fallen stalagtites - stalagmites at the bottom of the approximately 475
ft deep hole.
Not exact matches
Measuring 305m (1,000
ft) across and 123 m (400
ft)
deep, the Blue
Hole is almost perfectly circular and can be found in Lighthouse Reef Atoll.