Economy North Korea blows up nuclear test tunnels amid doubts over summit Updated : May 24, 2018 05:27 PM IST North Korea has conducted all six of its nuclear tests at the Punggye-ri site, which consists of tunnels dug beneath Mount Mantap in the northeast of the country. A small group of international media selected by North Korea was on hand to witness the demolition, which Pyongyang says is proof of its commitment to end nuclear testing. The destruction of the site began at about 11 a.m. with the blowing up and collapsing of a tunnel and an observation post. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.