El Túnel Naranja

The entrance is a clear opening at the foot of the volcanic cliff, visible from the boat before you slip into the water. Inside, the gallery closes around you and the rock disappears under colour: orange Astroides cup coral and orange encrusting sponges share every surface, walls and ceiling alike. The passage runs roughly 50 metres. Part-way through, small air domes break the ceiling and you can surface, talk to your buddy, and descend again. Natural light reaches the gallery from both openings and through the domes, so the orange reads as orange even without a torch — but a light angled along the wall brings the colour to neon and makes the macro detail in the polyps visible. A school of corvinas usually holds in the dimmer middle stretch. At the far end, the gallery opens into broken volcanic terrain at the base of the cliff: fallen blocks form short passages and erosion canyons run over Posidonia meadows back towards the main fracture.

The reason to come back is the coral, not the topography. Several sites in Cabo de Gata host Astroides calycularis, but only a handful have it dense enough to define the dive. The conservation literature names three of them — Punta de la Isleta, Cueva del Frío, and El Túnel Naranja — and on a coast with dozens of named sites that puts this one in the small set worth diving for what is on the rock rather than what swims past. The shape of the dive is the second piece. A 50-metre gallery with multiple openings, natural light, and air domes in the ceiling is technically an overhead environment but practically the most accessible form of one: no cave certification, no exit anxiety, a calm shallow profile. It is the rare site that sells a protected-species story without asking the diver to be advanced.

The site is shallower than it feels. At 3-12 metres, lung-volume changes have a larger relative effect on buoyancy than at depth, and a marginal weight setup will drift you towards the ceiling. Add half a kilo to a kilo over your usual lead before this dive — local divers are explicit about this. Bring a torch even though you do not strictly need it for navigation: it brings the orange close on the wall and gives you redundancy in the short overhead. The coral is the rule that matters most. No fin contact, no finger contact, no prolonged hovering directly under coral-coated overhangs where bubbles accumulate. Centres run El Túnel Naranja paired with another shallow-to-mid site on the same trip, typically Las Hermanicas, La Amatista, or Cueva del Francés depending on departure port and conditions.