Dramatic and unprecedented plumes of methane - a greenhouse gas 20 times more potent than carbon dioxide - have been seen bubbling to the surface of the Arctic Ocean by scientists undertaking an extensive survey of the region.
The scale and volume of the methane release has astonished the head of the Russian research team who has been surveying the seabed of the East Siberian Arctic Shelf off northern Russia for nearly 20 years.
In an exclusive interview with the Independent, Dr Igor Semiletov, of the Far Eastern branch of the Russian Academy of Sciences, said that he had never before witnessed the scale and force of the methane being released from beneath the Arctic seabed.
"Earlier, we found torch-like structures like this but they were only tens of metres in diameter. This is the first time that we've found continuous, powerful and impressive seeping structures, more than 1000m in diameter. It's amazing," Semiletov said. "I was most impressed by the sheer scale and high density of the plumes. Over a relatively small area, we found more than 100 but, over a wider area, there should be thousands."
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Scientists estimate that there are hundreds of millions of tonnes of methane gas locked away beneath the Arctic permafrost, which extends from the mainland into the seabed of the relatively shallow sea of the East Siberian Arctic Shelf.
One of the greatest fears is that with the disappearance of the Arctic sea-ice in summer, and rapidly rising temperatures across the entire region, which are already melting the Siberian permafrost, the trapped methane could be suddenly released into the atmosphere, leading to rapid and severe climate change.
Semiletov's team published a study last year estimating that the methane emissions from this region were about 8 million tonnes a year, but the latest expedition suggests this is a significant underestimate of the phenomenon.
In late northern summer, the Russian research vessel Academician Lavrentiev conducted an extensive survey of about 25,900sq km of sea off the East Siberian coast. Scientists deployed four highly sensitive instruments, seismic and acoustic, to monitor the "fountains" - or plumes - of methane bubbles rising to the sea surface from beneath the seabed.
"In a very small area, less than [25,900sq km], we have counted more than 100 fountains, or torch-like structures, bubbling through the water column and injected directly into the atmosphere from the seabed," Semiletov said.
"We carried out checks at about 115 stationary points and discovered methane fields of a fantastic scale - I think on a scale not seen before. Some plumes were 1km or more wide and the emissions went directly into the atmosphere - the concentration was 100 times higher than normal."
Semiletov released his findings for the first time last week at the American Geophysical Union meeting in San Francisco.