We pick you up and we head to the dive site. . The “Blue Hole” looks like a man-made well located at Vouliagmeni area, very close to Vouliagmeni lake. The “Blue Hole” is considered to be connected with Vouliagmeni lake through an underwater cave system that has not been explored yet. All divers should be certified at least Open Water Diver level and will be DAN insured.