Buoyancy

Buoyancy: Buoyancy excercise: At the left entrance someone has placed a square made of platic pipes where one can swim through. Unfortunately the water was quite hazy there. — Nikon D200, Nikkor 10.5mm DX Fisheye, Riedsort, Lake Lucerne, 16 August 2009. Nikon D200, 1/180 s, F/7.1, 10.5 mm, ISO 400, Sunday, August 16, 2009 14:13:03