Matsushiro Zōzan Underground Tunnels

Overview

The Matsushiro Zōzan Underground Tunnels are war relics constructed in Matsushiro-machi, Nagano City, Nagano Prefecture, towards the end of World War II. During the war, they were built in utmost secrecy as part of a plan to relocate the Imperial Headquarters, government ministries, and other key agencies to this location as a last-ditch defensive position for a mainland battle. Construction, which began on November 11, 1944, and ended with the war's conclusion on August 15, 1945, took only nine months, resulting in a network of tunnels totaling approximately 10km in length. This location was chosen not only for its geologically stable bedrock but also for its distance from the coast and its strategic importance as the site of the Kawanakajima Battles. However, due to labor shortages at the time, many Koreans and Japanese were reportedly forcibly mobilized. Since 1989, a portion of the Matsushiro Zōzan Underground Tunnels have been open to the public as a valuable war relic to convey the importance of peace to future generations. Inside the tunnels, displays of documents and photographs offer a glimpse into the conditions of the time, allowing visitors to reflect on the horrors of war and the preciousness of peace. When visiting, please ensure your safety by wearing a helmet, etc. Eating, drinking, smoking, graffiti, gatherings, and any other activities that may disturb other visitors are strictly prohibited. Please dispose of any trash properly and help preserve the natural environment. The Matsushiro Zōzan Underground Tunnels serve as a valuable place to learn about history and contemplate peace. We encourage you to visit.