Underwater Logging Ltd. has been in business since 1994 and is unique because of its use of specific technology to retrieve and harvest trees thought to be lost forever under the water. Floating the logs in the large rivers and lakes was one of the most feasible methods of transporting the massive saw logs from the bush to the lumber mills. Along the way many logs became waterlogged and sank to the bottom of the bodies of water. After many years of log drives, large quantities of wood have accumulated in certain areas.

Because of the reduced oxygen and light levels, decomposition is greatly reduced and allow the sunken logs, which may have sunk hundreds of years ago, to be preserved to this day.

UWL, owned and operated by Frank and Theresa Marks in Castlegar B.C. along with Andy Mayr in Calgary Alberta, has engaged in the retrieval of logs and in the harvesting of submerged forests still standing. Using sonar equipment to locate the sunken logs, Frank, Theresa and their crew work the waters of the Arrow lakes, from Nakusp to the Keenleyside dam.