Greenpeace demands an end to oil and gas exploration in the Arctic.
A slick of oil floats near their North Sea mission.
The environmental organisation released this footage of Total's Elgin platform, which has been leaking gas for more than a week.
The French company is spending $1 million a day trying to plug the leak.
The Greenpeace expedition chief says the air smells of chemicals.
(SOUNDBITE) (English) GREENPEACE EXPEDITION LEADER, DR. CHRISTIAN BUSSAU:
"This accident is a serious accident. It will not be easy for Total to solve the problem and therefore our demand is: No oil exploration in the Arctic, this is far too dangerous, this is far too risky and therefore we do not want the oil industry to go into the Arctic.
Total plans to investigate sites where it can drill relief wells and begin injecting mud into the shaft to finally stop the leak.
Lindsey Parietti, Reuters