Sometimes we get a group that just loves to snorkel! Lucky for us and them, here on Andros we are blessed with fantastic snorkelling at the many of the blue holes. These systems of limestone tunnels were created during the ice ages when sea levels in this area were over 200ft lower than today. Acidic rain water eroded the limestone creating the hundreds of visible cave systems. Once sea levels rose again, these subterranean caverns filled up with sea water, creating what we call blue holes. Being subject to tidal influence, marine caves are surrounded with healthy hard and soft corals which attracts plenty of fish and invertebrates, in effect offering great snorkel sites!