The submerged grotto entrance is at 6m (20ft ). Located along the Georgian Bay shoreline about 19km East of Tobermory. Trail Access for hikers from Cyprus Lake Head of Trails. Explore the hidden passages that lead from inside the Grotto to the open waters of Georgian Bay. Recommended for all levels of diving experience and snorkelers. Diving access via boat from Tobermory. Depending on the weather, you can moor the boat and have lunch in a large grotto.