The temperature of the oil is about 115 degrees travelling through the pipe and so putting them underground would not always work as some of the territory covered was permafrost (remains below freezing for at least two years). Putting the warm oil through this permafrost would create marshy areas, altering the ecosphere of the area (though I seriously doubt THAT was a major concern of the oil companies). Because of this some 420 miles of the pipeline are above ground - 5 to 10 feet above ground to allow for caribou migration.
The project took nearly two years to complete and incurred cost overruns of 1000%! The oil started flowing in June 1977, arriving in Valdez almost a month later. And the oil companies started making a profit only ONE WEEK LATER! Though it flows now at about 70% of what it once did (because the oil is after all running out), the pipeline has exceeded its intended lifespan by over a decade.
~later, tw
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