According to Google, a typical chainmail hauberk could have as many as 45,000 10mm rings - if we assume that 2cm rings are not excessively more difficult to make than 10mm rings, then 45,000 2cm rings linked end-to-end would stretch around 900m long.

Even assuming the chain didn't float in the air and instead draped down the rock and along the ground, it would likely take "only" 3-5 chainmail hauberks' worth of rings to cover the distance.

It wouldn't be an easy task, but there were far more than 5 people in medieval times with full sets of chainmail armor, so it's definitely not outside the realm of possibility.