Fig. 29: Ice divers and dogs must be kept on a lead. Without it you might not find the way back to the hole. There's not enough air in your tank to wait for spring. DiveZone ice diving event, Lake Klöntal. — EXIF: Nikon D3; Δt=1/5000 s; f=70 mm; f/2.8; ISO 200; 2014-03-01 12:27:11
