Greenpeace claims it is “impossible to estimate” the magnitude of the oil spill from the NITC tanker which sank off China earlier this month.

The Chinese State Oceanic Administration recently said that oil from the 164,000-dwt Sanchi (built 2008) may now cover an area of 332 sq km, much larger than previously reported.

“This is an evolving situation and accurate information about the amounts of oil spilled already and likely to be spilled in the future is not available,” said Paul Johnston, head of Greenpeace International’s science unit.