Way up, elevation. Up to the sky, 50 m higher. Or less. Whatever. Frozen winds howling inside the concrete structure, like whispering warnings. Jumping up to the frozen water, avoiding slipping. Catching the ladder, firmly. Looking up. Climbing, in a too small space, backpack knocking on the structure. Stopping. Climbing again. 'til the first platform. Looking down. And, climbing again, 'til the top. Exit. Breathing up. Feeling up. Feeling cold. Climbing down.