Experts from the Organisation for the Prohibition of Chemical Weapons begin their complex mission of finding, dismantling and ultimately destroying an estimated 1,000-tonne chemical arsenal.

An advance group of international inspectors arrived in Syria on Tuesday to begin the ambitious task of overseeing the destruction of President Bashar Assad’s chemical weapons programme.

Twenty inspectors from a Netherlands-based chemical weapons watchdog crossed into Syria from neighbouring Lebanon on their way to Damascus, to begin their complex mission of finding, dismantling and ultimately destroying an estimated 1,000-tonne chemical arsenal.

The experts have about nine months to complete the task, which has been endorsed by a U.N. Security Council resolution that calls for Syria’s chemical stockpile to be eliminated by mid-2014. It is the shortest deadline that experts from the Organisation for the Prohibition of Chemical Weapons have ever faced in any nation, and their first mission in a country at war.

Upon arrival in Damascus, the inspectors are expected to meet with Foreign Ministry officials later Tuesday.

Experts at The Hague, where the OPCW is based, said on Sunday the inspectors’ priority is to achieve the first milestone of helping Syria scrap its ability to manufacture chemical weapons by a November 1, 2013 deadline, using every means possible.

That may include smashing mixing equipment with sledgehammers, blowing up delivery missiles, driving tanks over empty shells or filling them with concrete, and running machines without lubricant so they seize up and become inoperable.

Some of the inspectors will be double-checking Syria’s initial disclosure of what weapons and chemical precursors it has and where they are located. Others will begin planning the logistics for visits to every location where chemicals or weapons are stored.

Within a week, a second group of inspectors is scheduled to arrive fewer than 100 combined and form teams that will fan out to individual sites.

Their routes are secret both for their safety and because Syria has the right not to reveal its military secrets, including base locations.

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