The Center for Strategic and International Studies has put out a report that says that North Korea appears to be expanding work at its nuclear test site and adding a second tunnel. Meanwhile, U.S. and South Korean officials say that North Korea is ready to conduct a nuclear test any day.
The think tank said that preparations at the Punggye-ri Nuclear Test Facility's Tunnel Number 3 have been completed and the site is ready for a nuclear test and said that their analysts have spotted new construction at tunnel number 4 at the facility, which they said is "strongly suggesting an effort to re-enable it for potential future testing".
The think tank said that preparations at the Punggye-ri Nuclear Test Facility's Tunnel Number 3 have been completed and the site is ready for a nuclear test and said that their analysts have spotted new construction at tunnel number 4 at the facility, which they said is "strongly suggesting an effort to re-enable it for potential future testing".