La Catedral

Torches on at twelve metres and the rock face opens into a mouth wide enough for three divers abreast. Inside, the water still glows blue from the entrance behind you while the chamber ahead darkens. Your guide signals up. You rise through the chamber until your head breaks the surface in a sealed room, regulator out, voices echoing off rock. Stalactites cover the ceiling, well above the waterline, picked out only in the sweep of torch beams. Back underwater at twelve metres, the connecting tunnel begins. Single file. Walls close. Transparent shrimp scatter in the light. A sharp left turn, a duck under low rock, and the main chamber reopens with the cavern mouth glowing blue ahead. Outside, the reef picks up where the cavern leaves off: an anemone garden flanks the exit, groupers hang in the mid-water, and a swim-through carries the safety stop.

Most cavern dives let you look in and turn back. La Catedral hands you a surface. Rising into the air dome, removing the regulator, and looking up at stalactites that formed before the sea reached this chamber is not a standard recreational moment. The dome ceiling sits well above the waterline, the room is sealed off from the open sea, and the only way in or out is the cavern mouth you came through. The connecting tunnel adds an overhead sensation that feels committed without actual risk: light from the entrance is visible from the main room, and the passage is short enough to clear in under a minute. Cala Llonga's east-coast position keeps the site sheltered when wind shuts down west-coast plans. For Open Water divers, this is as close to real cave diving as the certification allows, and three different operators position it the same way.

Bring a torch or rent one at the centre for around 5 EUR. The connecting tunnel is single-file with a sharp turn and a brief duck-under: if confined spaces are not your thing, skip the tunnel and still get the air dome, the main chamber, and the external reef. Cala Llonga sees heavy boat and jet-ski traffic in summer, so deploy your SMB before surfacing and run the line throughout if you shore-dive. The shore route is a 200-metre surface swim from the beach exit on the right side of the bay, descending once you clear the swimming zone. The red pebbles on the seabed mark the cavern entrance if you arrive without a guide. Morning slots cut surface traffic and clean up the external-reef visibility.