Underwater logging is the process of logging trees from underwater forests. When artificial reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

s and dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

s are built, large areas of forest are often inundated; although the trees die, the wood is often preserved. The trees can then be felled using special underwater machinery and floated up to the surface. One such machine is the Sawfish harvester

Sawfish harvester

The Sawfish harvester is a submersible robot produced by the Triton Logging Inc.. It is designed for cutting down submerged trees and popping them to the surface, with large pincers and a chainsaw. Such trees are generally submerged when dams are built near existing forests, and their wood...

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Underwater logging has been introduced in select locations around the world, including Ghana's Lake Volta

Lake Volta

Lake Volta is the largest reservoir by surface area in the world, and the fourth largest one by water volume. It is located completely within the country of Ghana, and it has a surface area of about 8,502 km² . Lake Volta lies along the Greenwich Meridian, and just six degrees of latitude...

, the largest reservoir by surface area in the world.

A related form of logging consists of salvaging logs which loggers have abandoned after they became waterlogged and sank.