Fig. 1: Aerial view of flying over the fog sea. Air field Triengen was covered by a thick layer of clouds. We flew underneath it until we found a blue hole above Lake Sempach and then climbed above the clouds. Nikon D200; Δt=1/320 s; f=28 mm; f/9.0; ISO 200; 4 January 2009 12:00:36
