A grouping of electrical services which are fed from the main switchboard.

The ratio of the second moment of area to the distance measured from the neutral axis to the extreme adge of the section, e.g. the deck or bottom plating of a ship.

The 90t, 13.6m x 3.4m x 3.4m covered cassette of 157 m3 maximum capacity accepted by the Swedish Railway, used for the transport of forest products from Scandinavia to North Europe.

Any suspicious act or circumstance threatening the security of a ship.

An action level established by an Administration or Contracting Government that represents their assesment of the likelihood that a security incident will be attempted or will occur.

An early warning detection system that prevents would-be intruders from boarding a vessel undetected. The system includes deck-mounted floodlights in combination with bridge wing searchlights.

Solids separated from a liquid.

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation.

The Seebeck effect is the electromotive force (emf) that develops across two points of an electrically conducting material when there is a temperature difference between them.

Tanks which are completely separated from the cargo oil and fuel oil systems and which are permanently applied for the carriage of ballast or cargo other than oil or noxious substances.

Separation of goods which for different reasons must not be stowed together.

A seine is a large fishing net that hangs vertically in the water by attaching weights along the bottom edge and floats along the top.

Fishing boat for purse seining.

An innovative fishing vessel equipped for multi-fishing methods characterised by relative low fuel costs due to the low power trawling requirements.

Built by Maaskant Shipyards, The Netherlands, TUNIS VAN LUUT UK-224 is the first Dutch fishing vessel equipped for multi-fishing methods and fitted with a unique fish processing plant featuring flo-ice as the precooling system.

Claimed to be the largest, purpose-built seismic vessel worldwide, the OCEANIC VEGA was delivered on 2nd July 2010 by Ulstein Verft.

Seismic surveys to locate subsea oil and gas bearing geological formation are carried out by seismic survey ships. The seismic ship periodically emits a percussive signal from an airgun array, which is reflected from subsea formations.

A seismic source is a device that generates controlled seismic energy used to perform both reflection and refraction seismic surveys.

Seismic tomography is a technique for imaging the subsurface of the Earth with seismic waves produced by earthquakes or explosions.

Seismology is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies.