Canons

Porous rock defines this rocky ridge from the first moment on the bottom. The NE-SW formation sits at 15 metres at its shallowest, and the surface is not smooth — it is cratered, punctured, and textured with holes that serve as apartments for everything that hides. Sweep a torch beam across the face as you move along the ridge's axis. Groupers hold position in the open water beside the ridge, but the real population lives in the rock: lobsters packed into cavities, conger eels retreating from light, octopus pressed flat in crevices barely wider than your hand. Nudibranchs cling to the shadowed surfaces where only direct torchlight reveals them. Sand flanks both sides of the ridge, and the deeper end drops to 25 metres where the crevices grow wider.

Canons is the Maresme coast's torchlight dive. Other ridges in the Port Balis sector offer similar depth and orientation, but none have rock this porous. The texture creates micro-habitats at a density that concentrates crevice species into a smaller footprint than a smooth ridge ever could. Moray eels are the most commonly sighted species — frequently recorded — but the lobsters and groupers are equally dependable. For macro photographers, the rock itself becomes part of the shot: textured substrate, cooperative sedentary subjects, and the natural drama of a torchbeam picking life out of darkness.

Bring a torch. This is not a suggestion — without one you will miss the majority of crevice residents that make Canons distinctive. Posidonia Dive runs trips from Port Balis, and the boat ride is short. At 15-22m on the main sections, air consumption is manageable on a standard tank, but slow movement matters more than distance covered here. Treat it as a search dive rather than a traverse. The deeper 25m end is worth visiting for wider crevices, though centres may require AOW certification for that section.