Denver (US): The US Army has begun destroying the nation's largest remaining stockpile of chemical weapons, using explosives to rip open a container of mustard agent inside a sealed chamber and then flooding it with another chemical to neutralise it.
It was the first few pounds of 2,600 tons of mustard agent that will be destroyed at Pueblo Chemical Depot in southern Colorado, most of it contained in about 780,000 shells.
"Everybody's really excited, but we're being cautious, making sure all the procedures are followed exactly," said Bruce Huenefeld, manager of the first destruction process to get underway at the depot yesterday.
Mustard agent can maim or kill by damaging skin, the eyes and airways. It's being destroyed under a 1997 international treaty banning all chemical weapons. It will take four years to destroy the Pueblo stockpile.
Another 523 tons of mustard and deadly nerve agents are stored at Blue Grass Army Depot in Kentucky. Blue Grass isn't expected to start destroying its weapons until 2016 or 2017, finishing in 2023.
The destruction process is safe, officials said.
Most of Pueblo's stockpile will be dismantled and neutralised in a highly automated USD 4.5 billion plant built at the depot.
About 1,400 damaged shells and a dozen metal bottles of mustard agent are considered unsuitable for that plant. They'll be opened with explosives and neutralised in the sealed chamber, which sits inside an airtight structure near the larger automated plant.
The metal bottles contain mustard that was extracted from the shells for testing.
A single bottle was the first container to be opened and neutralised yesterday. Crews were waiting for the neutralisation to finish before draining the chamber, rinsing it and then removing the remains of the bottle.
Once all the bottles are destroyed, crews will start work on the damaged shells, depot spokesman Thomas Schultz said.
The automated plant isn't expected to begin work until December or January. Design and construction have taken years, and final testing and training are underway.
Mustard agent is a thick liquid, not a gas as commonly believed. It has no colour and almost no odour, but it got its name because impurities made early versions smell like mustard.