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Nagasaki Museum

Sumiyoshi Tunnel Factory

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三菱兵器住吉トンネル工場跡

Explore tunnels of a WWII-era factory that aided atomic bomb victims and manufactured torpedoes.

Sumiyoshi Tunnel Factory
Houjyou-Minori CC BY-SA 3.0 resized via Wikimedia Commons

What it is

  • Remains of the Sumiyoshi Tunnel Factory.
  • Built as an evacuation factory for Mitsubishi Heavy Industries.
  • Constructed at the end of the Pacific War.
  • Designated as a B-rank atomic bomb-affected structure.

What to see

  • Six excavated tunnels called Sumiyoshi Tunnel.
  • A Type 91 torpedo displayed inside Tunnel 1.

When to go

  • Open to the public since March 30, 2010.

Notes written by Japan Gems from facts in Japanese Wikipedia.

Where it is

Sumiyoshi Tunnel Factory Open in Google Maps

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