These stunning shots show the beautiful and eerie underwater world of a Swiss ice-filled Alpine lake. Taken in Lake Sassolo, close to the southern border with Italy, these were taken by diving photographer Franco Banfi. Although the high altitude region is known for its sunny weather, the lake was formed by the run-off of the Alps surrounding it. The giant ice structures dwarf the tiny divers as they explore the nooks and crannies of the icebergs.