Army Brigadier General Neil Tolley, commander of US special forces in South Korea, told a conference held in Florida last week that Pyongyang had built thousands of tunnels since the Korean war, The Diplomat reported.

“The entire tunnel infrastructure is hidden from our satellites,” Gen Tolley said. “So we send (South Korean) soldiers and US soldiers to the North to do special reconnaissance.”

“After 50 years, we still don’t know much about the capability and full extent” of the underground facilities,” he said, in comments reported by the National Defense Industrial Association’s magazine on its website.

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