Construction of the Trans-Alaska Pipeline System with the Denali Fault, a major cause of earthquakes, and with large amounts of permafrost. In 1969, the unincorporated Trans-Alaska Pipeline System group drilled a series of core samples north of the Brooks Range that demonstrated how ubiquitous the permafrost was along the route. This forced the design of an elevated pipeline, which was tested in a loop built near Barrow. This elevation required the pipeline to be insulated, since extreme cold temperatures caused the metal to become brittle, even when hot oil was being pumped through the pipeline. After ecological objections forced subterranean pipeline crossings (in order to allow
Central Europe Pipeline System European countries, known as the Northern European Pipeline System (NEPS). The pipeline system was founded in the late 1950s by NATO being funded as part of the NATO Common Infrastructure Program, with the various participating countries already having some of the infrastructure and capabilities required to operate such a system. In the 1980s, the pipeline was attacked several times by terrorist organizations. The Belgian communist terrorist organisation Communist Combatant Cells carried out five bombings against the pipeline on 11 December 1984, and one more attack on 6 December 1985. Earlier that year, in April 1985, a bomb attack was carried