At the top of this amazing reef is a large blue hole about 8 metres across and this provides access to Virgin Blue Hole. Found on the western part of Ngemelis Island, this is a vertical wall reef; at Blue Corner, the reef eventually merges with Ngemelis wall. The entrance leads down to a vertical shaft that goes through the reef, down 30 metres, into a cavern with a sandy bottom.

The shaft is then connected to the open ocean by a 10-metre wide tunnel that is 50 metres along. Amidst all of this, there are four deep canyons that cut through the reef and create additional small caves, crevices, and windows to explore. For divers who enjoy cave diving for its exploration, this is a fantastic site.

Divers will need to have adequate cave diving experience to complete this dive especially as the cavern drops down to around 30 metres and the tunnel goes down to 40 metres. The currents are also strong along the reef and can be unpredictable.

Along the sandy bottom, there are many species of nudibranchs and crustaceans. The inside of the cavern is decorated with many soft corals and the opening is patrolled by large groups of snapper, tuna, and barracuda. The reef wall has most tropical fish on it and in large quantities and the swim along the wall is a spectacular exploration of the vast array of marine species that exist.