"The impact of a spill will be catastrophic," says UN humanitarian coordinator for Yemen, David Gressly, adding "our estimate is that $20 billion would be spent just to clean the oil spill."
The UN said the emergency part of a two-stage operation would see the toxic cargo pumped from the storage platform to a temporary replacement vessel at a cost of $79.6 million.
A new report by Greenpeace has cautioned that a possible oil spill from an abandoned vessel would prevent access to crucial ports and affect food aid supply to 8.4 million people.
A major environmental, humanitarian and economic disaster lies in wait in the Red Sea - and there's only a tiny window of opportunity to prevent it.
If action is not taken to deal with a deteriorating oil tanker stranded off Yemen's coast there is a risk it could spill four times as much oil as the 1989 US Exxon Valdez disaster, UN says.
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