Ocean Background
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Hydrographic survey is the process of gathering information about  
navigable waters for the purposes of safe navigation of vessels. It strictly  
applies to survey of any navigable waters applied to marine navigation.
 
Seismic survey. Also known as a seismograph survey is a survey of an  
area by means of an instrument which records the vibrations of the  
earth. By recording the time interval between the source of the shock  
wave and the reflected or refracted shock waves from various formations,  
geophysicists are able to define the underground configurations.

Geophysical survey refers to the systematic collection of geophysical  
data for spatial studies. Geophysical surveys may use a great variety of  
sensing instruments, and data may be collected from above or below  
the Earth's surface or from aerial or marine platforms.

An underwater trenching system comprises a closed trenching  
system that vacuums up sediment removed during the trenching  
operation and deposits that same sediment into the trench, thereby  
burying a pipeline that has settled into the trench.  

A cable layer is a deep-sea vessel designed and used to lay  
underwater cables for telecommunications, electricity, and such. A  
large superstructure and one or more spools that feed off the transom  
distinguish it.

Fiber Optic Cables. A marine cable for a fiber optic waveguide with  
regenerator supply. A marine cable for a fiber optic waveguide must be  
provided with an electrical conductor for energy supply, in order to  
supply energy to the regenerators. For this purpose, the optical  
transmission elements are surrounded by a stranded layer of metal  
wires with good conductivity, which serve to supply energy.
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