Pedra da Pata Roxa

Descend onto a mixed sand-and-rock bottom at 24-26m, twenty minutes by RIB southwest of Cascais marina. The site is a large sandy expanse cut through by rocky outcrops, one running up to a metre and a half high, and the dive is built around working the exact line where the two meet. That border is where the small-spotted catshark, the fish the site is named for, is reported to rest, and a slow approach along it is what turns a sighting into a close one. Visibility here runs 2-10m depending on sea conditions, lower than the coast's usual 10-15m boat-dive range, so the terrain reads at close range rather than as an open vista. There is no fixed route, entry pattern or landmark beyond the rock-sand line itself: this is a single, compact feature rather than a long reef to swim end to end, and most of a dive here is spent working that one border, patiently, at depth.

Most of the named dives on this stretch of coast are sheltered bays under 18m, built for beginners and try-divers. Pedra da Pata Roxa is not: it sits deeper, further out, and its case rests on one thing rather than terrain variety, a species. Three independent write-ups converge on the same animal at the same spot here: the small-spotted catshark, resting where sand meets rock, close enough for a careful diver to photograph. The site has no cave, wall or artificial structure to fall back on if the shark stays hidden; the sand-rock interface and what lives on it are the whole dive.

Every account of this site describes the same encounter: a macro subject that rewards patience rather than a wide-angle reef. The catshark rests low, at the sand-rock border, and a fast or careless approach sends it off before a camera comes up. A slow fin stroke and a low, level profile are what separate a distant sighting from a frame-filling one, and every source that mentions the dive credits exactly that approach for its close-range images. Octopus work the same stretch of rock without drawing the same attention, a secondary subject rather than the reason to come.

A local dive centre currently runs the boat trip out to the site; no shore-entry option exists. The depth, 24-26m typical and 30m maximum, sits past Open Water limits, so plan this as an Advanced Open Water dive regardless of how gentle the catshark encounter itself feels. Visibility can drop as low as 2m, so stay close to your buddy and use the rock-sand border as your reference line rather than relying on a wide view. Approach the border carefully, hovering rather than settling, both to protect the animal you came to see and to keep the water clear for the diver behind you. No marine reserve, permit or diver quota applies to this site or the wider Cascais/Estoril cluster.