Earlier this week protesters hung from the underside of the rig Environmental activists have disrupted drilling on board an oil exploration rig in Arctic waters as part of an ongoing protest.
Greenpeace said 18 activists climbed onto the Leiv Eiriksson rig off the coast of Greenland.
They called for details of how the operator would respond to an oil spill.
Edinburgh-based Cairn Energy said drilling was suspended after the protesters breached a restricted area on the rig.
Earlier this week, two Greenpeace protesters occupied the 53,000-tonne drilling vessel, operated on behalf of Cairn Energy.
Protesters hung from the underside of the rig in an Arctic survival pod and were removed by Danish police.
The latest protest was launched from the Greenpeace ship Esperanza in five inflatable speedboats, from outside an 500-metre exclusion zone.
Campaigner Ben Ayliffe said: “Experts say the freezing temperatures and remote location mean a deep water blow-out in this stunning pristine environment would be an irreversible disaster.
“If they published the plan, the dangers of investing in such a high risk venture would be laid bare. We have to draw a line in the ice and stop the Arctic oil rush.”
Cairn announced this week that it had begun drilling two wells in the region.
The two wells are approximately 100 miles (160km) and 185 miles (300km) off Nuuk, the capital of Greenland. Each drilling operation is in water deeper than 2,953ft (900m).
In response to Greenpeace demands to see Cairn’s oil spill response plan, the energy company said: “As stipulated by Greenland authorities, the oil spill response documents are not publicly available.”
In a statement, the company added: “Wherever it is active, Cairn operates in a safe and prudent manner.
“The Greenland Bureau of Minerals and Petroleum has established some of the most stringent operating regulations anywhere globally, which mirror those applied in the Norwegian North Sea.”
“It is in the interests of the Greenland government to put in place the most stringent and robust measures. Cairn takes its responsibilities such as oil spill contingency and response plans very seriously.”
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