Fig. 50: Getting in is sometimes easier than getting out. The triangular shaped hole has tighter angled corners, which are helping for getting out. DiveZone ice diving event, Lake Klöntal. — EXIF: Nikon D3; Δt=1/2000 s; f=70 mm; f/2.8; ISO 200; 2014-03-01 13:17:59
