Tenerife

Carry a surface marker buoy, dive computer, audible signal, certification card, and insurance information. Use local guides for wrecks, La Catedral, Las Eras, Teno, north-coast routes, caves, or current-prone sites. Do not penetrate wrecks or caverns without training. Freedivers should never train alone and should use floats, lines, and competent buddies. Snorkelers should follow flags and avoid surge-prone lava entries. A Tenerife-specific rule: do not drive or ride up to Teide after diving until your dive computer and conservative altitude guidance allow it.

For serious injury, suspected decompression illness, missing divers, boat emergencies, or dangerous sea conditions, call 112. The Hospital Universitario de Canarias in La Laguna hosts the regional hyperbaric medicine resource used for decompression illness and related emergencies; activation should go through emergency services and dive medical coordination rather than self-driving. DAN Europe offers a 24/7 diving emergency hotline for medical advice and coordination.

The Teno-Rasca marine area protects reefs, sea caves, sandbanks, seagrass habitat, turtles, dolphins, and other species. Keep fins and anchors off seagrass, use legal moorings or authorised anchoring fields, take all trash out, and avoid touching the seabed. Responsible whale-watching rules include keeping distance, limiting observation time, slowing near animals, leaving if animals show disturbance, and never swimming with, feeding, touching, or making noise to attract cetaceans.