The Coast Guard, in conjunction with the Army Corps of Engineers and the Navy's Supervisor of Salvage, is reviewing a plan submitted by the owners and contracted salvors of a sunken tug and a barge impeding vessel traffic in the Elk River in the Upper Chesapeake Bay. The tug and barge, which sank in the shipping channel following a collision with a freighter, have caused the adjacent C&D Canal to remain closed to all vessel traffic pending their safe removal. Four men remain missing following the incident. The salvage plan, submitted by Norfolk Dredging Marine, the sunken tug Swift's owners, and Ellsworth Salvage, the contractor, must adequately address a number of safety, environmental, and navigational considerations in order to receive the agencies' authorization to begin operations.