36 Inch Pipe
The smooth sheet metal covering the field joint backscatters much less sound than the concrete coat and thus looks darker in the image. The three ½ inch bands binding the sheet metal are visible.
Courtesy of Oceaneering
The smooth sheet metal covering the field joint backscatters much less sound than the concrete coat and thus looks darker in the image. The three ½ inch bands binding the sheet metal are visible.
Courtesy of Oceaneering
THIS IMAGE WAS CAPTURED BY OR FEATURES A DIDSON™