May 8, 2025, by Joseph S. Bermudez Jr., Victor Cha and Jennifer Jun— The last of a three-part series on the Yongdok-tong Nuclear High Explosive Test Facility, a critical component in the research, development, test, and evaluation (RDT&E) of North Korea’s nuclear warheads, explores the underground facilities at Yongdok-tong and elsewhere.

May 2, 2025, by Joseph S. Bermudez Jr., Victor Cha and Jennifer Jun— The second of a three-part series on the Yongdok-tong Nuclear High Explosive Test Facility, a critical component in the research, development, test, and evaluation (RDT&E) of North Korea’s nuclear warheads, explores development from 2010s to today.

April 22, 2025, by Joseph S. Bermudez Jr., Victor Cha and Jennifer Jun— The Yongdok-tong Nuclear High Explosive Test Facility is the only known operating facility in the country for testing designs and components for high-explosive detonation of nuclear weapons. This is the most comprehensive report of this secret facility currently available at the unclassified level.