La Pedrosa

The tunnel crosses the islet between 18 and 24 metres, with sponges and red coral on walls and ceiling. A wide chimney rises through the passage before the exit. Past the exit the park describes the dive continuing beyond 30 metres, and one centre puts large boulders at 32 metres to the north, with good-sized lobsters among them. That is the deep end of the site and no part of every dive; what a group does there is the centre's call on the day.

The boat makes the crossing from L'Estartit port in about 15 minutes and moors to the islet, and the briefing decides whether the group takes the tunnel or stays in the cove. A posidonia meadow runs between 5 and 12 metres in the cove, which sits sheltered from north and east winds, and entering the tunnel is optional, since a circuit of the islet is offered. The park points the quiet cove dive at less experienced divers and the tunnel at those with more experience.

A passage some 70 metres long crosses the islet, wide and high, with most of its roof open to the sky. Daylight drops through the roof onto the red coral and sponges, and lobsters and slipper lobsters shelter among them.

The passage counts as an overhead environment even where the roof is open, so the group stays together and follows the plan agreed at the briefing. The guide confirms what each diver carries.

Red coral and sponges grow on the walls and the ceiling, and a fin tip or a dropped hand marks them. Keep trim level through the whole length of the passage.