I never post anything like this so I thought I would try to get some laughs out of it !
This is a video taken in 6000 feet (1.8km) of water. An undersea robot is sawing a 3mm wide slit (REMEMBER THAT WIDTH) in a pipeline. The pressure inside the pipeline is 0 PSI while the pressure out side is 2700PSI, or 1.3 tons per square inch (or about 200 Bar).
And then a crab walks by........
http://peligra.netcity.co.uk/mixes/crabvspipe11.mpg