Cabo de Palos

Dive boats depart Cabo de Palos harbour for the Islas Hormigas archipelago, where a chain of submarine mountains — Bajo de Dentro, Piles, La Morra, Testa — rises from the seabed to within metres of the surface. Each bajo is a submerged peak surrounded by walls, swim-throughs, and canyons colonised by gorgonians and inhabited by groupers that show no fear of divers. The marine life quantity inside the reserve is what sets Cabo de Palos apart: schools of barracuda thick enough to block the light, amberjack circling in mid-water, and the occasional sunfish drifting through. Thirty years of protection have created a density of life that earned claims of the best diving in all of Europe. Outside the reserve, the Naranjito wreck sits upright at 26-40 metres, while deeper wrecks at Bajo de Fuera — including the SS Sirio, an Italian passenger steamer that sank in 1906 — require technical credentials and 15-day advance notice.

Book well in advance for summer — daily diver limits are strictly enforced and centres fill up. Eight centres operate from the harbour, all reportedly under a price agreement. Expect thermoclines in summer: a 10-degree temperature drop is common, so carry more neoprene than the surface temperature suggests. The dive pace can feel industrial in peak season with 40-45 minute dives and catamaran-loads of divers. September-October is the golden period — best visibility, warm water, peak marine life, and fewer crowds.

The Islas Hormigas archipelago and its submarine mountains (bajos) are composed of Miocene limestone and calcarenite — remnants of an uplifted marine platform shaped by tectonic forces of the Betic Cordillera. The seamounts rise steeply from 40-60 metres to within a few metres of the surface, their walls and ledges carved by persistent currents into a complex terrain of pinnacles, crevices, and drop-offs that act as natural aggregation points for pelagic marine life.