Barnacles
April 20, 2011
Tank on the deck of the San Francisco Maru, Truk Lagoon, Micronesia. February 20, 2011.
Russian submarine, Varna Bay, Black Sea. June 21, 2010.
The stern of the Carnatic, Al Bahr al Ahmar, Gulf of Suez. May 18, 2009.
Photographs by gh0stdot.
Via these, via MetaFilter.