Fig. 113: Diving in the Saki Blue hole on Espiritu Santo. The freshwater of this source here is filtered through porous stones. The bottom is very soft silt. Espiritu Santo, Vanuatu. Nikon D200; Δt=1/100 s; f=10.5 mm; f/2.8; ISO 200; 27 July 2010 01:23:22
