Inner Grossa - Columbretes
The scuba route will begin at the same anchoring buoy No. 8 where the bottom, beside a rocky promontory, at a depth of just four metres, drops steeply to 15 metres. The proposal is to head for the north end of the island, encountering a profusion of large stones and rocky platforms along the way, like a labyrinth where huge lobsters hide taking refuge from the everpresent dusky grouper.