Cueva de las gambas

You walk in from Playa Chica beach and drop down a volcanic wall toward sand. Garden eels work the slope as you descend; on the wall itself the usual reef cast lines up — Atlantic damselfish, anthias, a yellow gorgonian here and there fixed to the basalt. The depth keeps building. At forty metres a recess opens in the wall on your left, the chamber the dive is named for. The protocol the centres still teach goes back a long way and is always the same: torches off into the cavern, eyes settle on the dim space, and on the guide's cue the lights come on against the back of the recess. The narwhal shrimp resolve out of the dark, dense in the better years, scattered in the leaner ones. The dusky groupers staged outside the entrance read the beams and move in to hunt; the sequence is the dive's reason for being. One or two well-managed minutes inside is the visit by design — bottom time at this depth costs deco time on the wall return. Divers equipped for it can edge below forty on the deep extension to see black-coral colonies; everyone else turns and works the wall back, picking up the shallow reef cast on the ascent before the swim home.

Among the routes that launch from the Playa Chica entry, Cueva de las Gambas is the only one that combines a defined cavern overhead with a documented predator-prey interaction at the recreational deep ceiling. Cathedral, further along the same wall, is the larger and shallower sponge-vaulted cavern; the veril sites are vertical reef. The shrimp recess is a different proposition — a deliberate, narrow visit to a small chamber where lighting the shrimp brings the groupers in, and where the choice to be there at forty metres in an overhead is part of the planning. The site is one of the named cavern dives along the Puerto del Carmen wall, with the dark-ambush grouper behaviour at the recess part of its long-standing local lore. Spanish-language community discussion across more than a decade has watched the shrimp population thin and rebound, and the dive's reputation has softened with it; that range, more than any single account, is the signal a visiting diver should plan around.

Depth and gas are the binding constraints. Bottom time inside the cavern is a deliberate one or two minutes; total dive time falls in the 35-45 minute range counting wall ascent and stops. EAN32 does not reach the cavern depth, so the standard plan is air or a leaner mix decided at the briefing. A primary torch is essential, with a backup; the protocol asks for torches off into the recess and a steady, focused beam against the shrimp at the back. Buoyancy and finning matter — the chamber silts up in seconds with poor finning, and the groupers spook with bouncing lights from multiple divers. Standard safety kit applies: dive computer with deco capability, SMB for the wall ascent, compass for orientation against the wall, plenty of redundancy on light. In winter the water is around eighteen degrees and a 7mm with hood and gloves is the practical minimum; summer dives run on a 5mm. Open Water divers can be guided to shallower routes from the same entry, but the cavern itself sits beyond their depth limit.