Key Facts
• 92 concrete structures, known as ‘pillboxes,’ identified in Hokkaido.
• Built during late WWII to defend against potential U.S. invasions.
• Located along the eastern coastline, including Nemuro City and Taiki Town.
• Structures feature 2.5-meter-thick concrete and strategic gun ports.
• Many have deteriorated due to waves, earthquakes, and time.
• Architect Kazuhiko Onodera began researching these relics 30 years ago.
• 2022: Onodera and colleagues compiled a report detailing locations and designs.
• Findings include trenches and inland pillboxes near river mouths.
• Report remains unpublished due to safety and land access concerns.
• Some pillboxes are on private or corporate land, complicating preservation efforts.
Summary
Hokkaido’s eastern coastline is home to 92 WWII-era pillboxes, built to defend against potential U.S. invasions. These concrete structures, equipped with gun ports, have deteriorated over decades due to natural forces and neglect. Architect Kazuhiko Onodera has spent 30 years researching these relics, culminating in a 2022 report documenting their locations and designs. However, the report remains unpublished due to safety concerns and land ownership issues. Despite their historical and cultural significance, these structures are not protected as cultural assets, leaving their future uncertain.
