History
Milanese climber Ivan Guerini and a group known as the “Sassisti” (“stone people”) began developing the valley's bouldering in the 1970s as a deliberate departure from traditional mountaineering. Guerini also co-established Oceano Irrazionale in 1977. Later key figures include Rudi Colli, Richard Colombo, Stefano Mogavero and Simone Pedeferri, who set most of the valley's hardest (8A–8B) boulder problems and free-climbed several Monte Qualido big-wall lines from the mid-1990s onward. The Melloblocco bouldering festival launched in 2004; the valley became a regional nature reserve in 2009.
