A 57-year-old Polish walker had to be rescued by helicopter shortly before 2.30 this afternoon after being overcome by altitude sickness when climbing Teide at just over 3,000 metres. He was airlifted to the helipad at the Adeje fire station, and then transferred by ambulance to Hospiten Sur. I’ve seen people plan to climb to the top of Teide with the slightest amount of preparation, and even go up with clothing suitable for the coast. It’s important to remember that it’s not just a case of low temperatures on a mountain of this size, but of altitude sickness too. No-one would climb Kilimanjaro, which is the highest free-standing mountain in the world, without significant mountaineering preparation, and it’s only 2,000 metres higher than Teide. Teide is 3,718m, and altitude sickness kicks in around 2,400m. Please be careful.