Fig. 109: Diving in the Saki Blue hole on Espiritu Santo. The freshwater of this source here is filtered through porous stones. That's just a small hole here where my camera fitted in. Espiritu Santo, Vanuatu. — EXIF: Nikon D200; Δt=1/60 s; f=10.5 mm; f/2.8; ISO 100; 2010-07-27 1:07:29
