Few museums let you walk through an actual military submarine, but the JMSDF Kure Museum in Hiroshima Prefecture does exactly that.

Nicknamed the "Iron Whale Museum," this maritime military facility offers something you won't find at most history museums: the chance to explore a real decommissioned submarine from bow to stern.

Since opening in 2007, the museum has welcomed visitors to learn about Japan's maritime defense forces, with free admission making it accessible to anyone curious about naval technology and the men and women who serve beneath the waves.

A Modern Maritime Archive

The Japan Maritime Self-Defense Force established the museum on April 5, 2007, in Kure, a city with deep naval roots in Hiroshima Prefecture. Kure served as a major naval base during Japan's imperial era and continues as an important JMSDF facility today.

The museum forms part of a network of JMSDF museums across Japan, each focusing on different aspects of maritime defense. While sister facilities showcase aircraft and surface vessels, the Kure location specializes in submarine operations and minesweeping, reflecting the critical but often hidden work of underwater defense.

From Torpedoes to Control Rooms

The museum displays various torpedoes and weapons systems used by the JMSDF, along with exhibits explaining minesweeping operations. Visitors can examine the technology used to detect and neutralize underwater mines, vital work that protects shipping lanes and coastal waters.

Interactive displays and artifacts tell the story of submarine development and the evolution of undersea warfare technology. The collection includes equipment and instruments that illustrate daily life aboard military vessels, from navigation tools to the cramped living quarters submariners call home during months-long deployments.

Walking Through the Akishio

The museum's centerpiece is the Akishio (SS-579), a Yushio-class diesel-electric submarine that served the JMSDF until its decommissioning in 2004. This isn't a replica or cutaway model but the actual vessel, carefully preserved and opened for public tours.

Visitors can walk through the submarine's narrow passageways, peer into the control room where crews navigated the depths, and see the torpedo tubes and periscopes firsthand. The 20mm guns and other equipment remain in place, offering an authentic glimpse into the confined spaces where submariners lived and worked. It's a rare opportunity to experience submarine life without joining the navy.

JMSDF Kure Museum Highlights & Tips

• Tour the Akishio Submarine Walk through the actual decommissioned Yushio-class submarine and explore the control room, torpedo tubes, and crew quarters.
• Minesweeping Exhibits Learn about the critical work of detecting and neutralizing underwater mines that threaten naval vessels and commercial shipping.
• Torpedo Display View the various torpedoes and weapons systems used by Japan's Maritime Self-Defense Force over the decades.
• Free Admission The museum offers completely free entry, making it an excellent budget-friendly destination for families and military history enthusiasts.
• Adjacent to Yamato Museum The museum is located next to the Yamato Museum, so plan time to visit both maritime attractions in one trip to Kure.
• Prepare for Tight Spaces The submarine tour involves narrow passageways and steep ladders. Wear comfortable shoes and be prepared for confined spaces.

Walking through the Akishio submarine reveals what photos and diagrams never can: the reality of life beneath the ocean's surface. The cramped quarters, the maze of pipes and controls, the constant hum of machinery all become tangible as you move through the vessel's interior.

The JMSDF Kure Museum makes naval history accessible and immediate, offering visitors a hands-on experience that honors the technical achievements and human courage of submarine service. For anyone passing through Hiroshima Prefecture, it's a chance to step aboard an iron whale and surface with new respect for those who patrol the depths.