This is a typical trench plow design. This is one way to dig a ditch underwater for pipeline construction

8 miles off the coast of New Jersey two 19th century Locomotives rest on the floor of the ocean.

The Storegga rock slide is at the continental shelf in the European North Sea off the coast of Norway . Measuring over 800 km in length, this is the one of the world's longest rock slides on a continental shelf. A huge mound of rubble has accumulated over thousands of years, causing an extremely rough sea bed for laying natural gas pipelines. The Norwegian high-tech firm of NAXYS AS , who specializes in intelligent underwater instrumentation and condition monitoring, has developed a long-term monitoring system to be installed at the Ormen Lange in 2007. This system was developed entirely in LabVIEW and eventually the Schmid Engineering ZBrainâ„¢ hardware deployment platform using the LabVIEW Embedded Module for ADI Blackfin.