http://gulaghistory.org/nps/onlineexhibit/stalin/work.php
Built between 1931 and 1933, the White Sea-Baltic Sea Canal was the first massive construction project of the Gulag. Over 100,000 prisoners dug a 141-mile canal with few tools other than simple pickaxes, shovels, and makeshift wheelbarrows in just 20 months. Initially viewed as a great success and celebrated in a volume published both in the Soviet Union and the United States, the canal turned out to be too narrow and too shallow to carry most sea vessels. Many prisoners died during construction.
http://www.nytimes.com/2005/06/06/international/europe/06rus...
Vorkuta, a city built by gulag labor in the tundra 1,200 miles northeast of Moscow and 100 miles above the Arctic Circle, is slowly dying - and those who remain in many cases cannot afford to leave.
A Soviet-era sign that remains atop a central building exhorts people to mine more coal, the resource that first attracted the gulag's architects in the 1930's and resulted in forced labor by two million prisoners before the camps shut down in 1950's.