Fig. 10: Around the hole a circle with spokes leading to the hole must be shoveled into the snow. These are useful for the divers for orientation and finding he way back to the hole in case they loose the rope. DiveZone ice diving event, Lake Klöntal. — EXIF: Nikon D3; Δt=1/320 s; f=70 mm; f/9.0; ISO 200; 2014-03-01 11:18:21
