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A series of unexplained leaks in Alberta, Canada, have continued unabated for more than 2 months, leading to outrage among residents of surrounding areas and environmentalists.

The Primrose site uses a controversial method of extracting bitumen called "cyclic steam stimulation," or simply "huff and puff."

Because the spills have occurred on a military testing site, media and public access to the affected areas have been restricted.

The company in charge, Canadian Natural Resources Ltd (CNRL), refuses to reveal how wide ranging the spill is and is assuring the public and Canada's regulatory agency that it is doing everything it can to manage the spill.