North Korea Conducts First Submarine-Launched Cruise Missile Tests in Years Amid Rising Tensions

North Korea announced on October 15, 2026, that it had successfully test-fired two types of submarine-launched strategic cruise missiles in the East Sea (Sea of Japan) the previous day, marking the first such underwater launches reported in nearly three years.[1][2] State media KCNA described the tests as verifying the readiness of underwater combat systems, enhancing naval strategic capabilities, and demonstrating the reliability of its war deterrent, with no adverse impact on neighboring countries.[3] South Korea's Joint Chiefs of Staff confirmed tracking the missiles, noting one launch via vertical launch tube and another through a torpedo tube, consistent with imagery suggesting deployment from the Hero Kim Kun Ok, a modified 3,000-ton diesel-electric submarine unveiled in 2023 and touted as a tactical nuclear attack platform.[4][5]

The tests occurred against a backdrop of heightened regional tensions, including a September 2026 landmine explosion in the DMZ that injured three South Korean soldiers (which Seoul attributed to Pyongyang), recent North Korean ballistic and hypersonic missile launches, and joint US-South Korea-Japan military exercises.[6] North Korea has criticized US support for allied submarine programs and rejected denuclearization demands. The event underscores Pyongyang's push for a survivable sea-based deterrent, though analysts note the Hero Kim Kun Ok remains a developmental platform with unproven full operational status and significant engineering challenges for sustained nuclear submarine capabilities.[7]

Multiple independent outlets, including Reuters, Yonhap, Al Jazeera, and Stars and Stripes, corroborated the KCNA reports with details on tracking, imagery, and context, confirming the tests' occurrence and strategic signaling.