Tube sponges

Tube sponges: Underwater reef landscape with tube sponges — Dunia Kecil, Wajil Batan, Rajat Empat, Indonesia, Nikon Coolpix 5400, Fischaugen-Vorsatz, March 15, 2005. Nikon E5400, 1/90 s, F/7.3, 24 mm, ISO 50, Tuesday, March 15, 2005 15:59:47