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They usually imply that open, deep and safe water lies ahead. They are also used to indicate the start and end of a buoyed section of a continuous narrow channel; and a series of them may mark a safe route through shallow areas. [1] It is therefore important to consult appropriate charts to determine their meaning in each location.
Especially in medieval times, the end of a chain could be attached to a chain tower or boom tower. This allowed safe raising or lowering of the chain, as they were often heavily fortified. [1] By raising or lowering a chain or boom, access could be selectively granted rather than simply rendering the stretch of water completely inaccessible.
The 1993 Big Bayou Canot train wreck of September 22, 1993 was the worst train wreck in the history of the United States passenger railroad company Amtrak.Investigation of this accident produced recommendations by the National Transportation Safety Board, the United States National Academy of Sciences, and the American Waterway Operators that the U.S. Army Corps of Engineers support production ...
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Cave diving guide line reel. A distance line, penetration line, cave line, wreck line or guide line is an item of diving equipment used by scuba divers as a means of returning to a safe starting point in conditions of low visibility, water currents or where pilotage is difficult.
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