The five are believed to have perished while exploring underwater caves at a depth of 50 meters, but exactly what happened has not been determined.
The five dived from a boat on Thursday morning, local time, and were reported missing when they did not return in the afternoon. By the evening, only one of them had been found dead; the others were still missing.
Weather conditions at the scene were reported to be poor, and authorities had warned that those out at sea should exercise caution.
