LAKEWOOD, Colo. (CBS4) – Crews will start digging for explosives left over from World War II training. It’s believed the explosives are still underground on Green Mountain in Lakewood.

The area is popular with hikers. A nearby area was used as an artillery range in the 1940s.

A new technology will be tested to determine if what’s below the ground is a harmless piece of metal or dangerous munitions.

Hikers have found munitions over the past several years. If they didn’t explode back in the 1940s they are considered unstable and could explode at any time.

(credit: CBS)