This is a video of a saw cutting a slit in an underwater pipe. At 6000 ft the pipe had 0psi pressure inside but 2700 psi from the water outside. Watch the unsuspecting crab walking by.
http://www.yellowdogracing.com/video/crabvspipe1.mpg
http://www.yellowdogracing.com/video/crabvspipe1.mpg
