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Underwater logging is the process of logging trees from underwater forests. When artificial reservoirs and dams 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.

A related form of logging consists of salvaging logs which loggers have abandoned after they became waterlogged and sank. This activity can be quite profitable, since the prime "targets" are decades-old trees of a size and species difficult or impossible to find in their natural habitat.

Remote Controlled Vehicle
One method of unearthing these sunken trees is by sending a remote controlled vehicle underwater to fell the trees, keeping the operator of the vehicle dry. An example of such a vehicle is the Sawfish Harvester. This vehicle is controlled by a cable that sends electricity and control inputs to the vessel which sends back a video feed for the operator. The operator sends inputs from a control panel on a barge. When a tree is found the Sawfish attaches and inflates a flotation device to it so that after the tree is cut it immediately rises to the surface for extraction from the water.