The low population density of this island has allowed these waters and seabeds to remain in an exceptional state of preservation and health when compared to the nearest peninsular coast. For this reason, this area was the first Spanish marine reserve that was opened in 1986. The total area is about 1400 hectares and bottoms range between 0 and 40 meters depth.

Almost at the outer edge of the marine reservation of Tabarca in GPS 38º09.231 N / 000º25.902, W; the sonar reveals the presence of a slab of rock which is around 50 meters long and about eight meters wide that stands on the sand bed at 25 meters depth.

We will descend over the small-submerged island, controlling the buoyancy to avoid damaging the bottom and after rigorous checks we will start a simple journey around the rock formation, where the maximum depth is around 19 meters.