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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. One such machine is the Sawfish harvester. Underwater logging has been introduced in select locations around the world, including Ghana's Lake Volta,〔(【引用サイトリンク】title=WSJ Article )〕 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. 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. ==External links== * (Wired.com Underwater logging article ) * ("Fortune In Drowned Logs", September 1934, Popular Science ) article on early salvage of sunken logs 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「underwater logging」の詳細全文を読む スポンサード リンク
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