OperationPluto (Pipe-Lines Under The Ocean) was a World War II operation by British scientists, oil companies and armed forces to construct undersea oil pipelines under the English Channel between England and France.
Along with the Mulberry Harbours that were constructed immediately after D-Day, OperationPluto is considered one of history's greatest feats of military engineering.
When the landing site for the invasion was switched from Calais to Normandy, the pipeline needed to be increased from its original length to around 70 miles, and the film tells of how the American pipeline industry became involved in producing the extra amount of HAIS pipe.
