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top view of tunnel with stairs
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top view of tunnel with stairs

Underground tunnel to prevent river flooding

A map marker首都圏外郭放水路 第一立坑, 春日部市, Japan
Calendar outlinedPublished on March 6, 2018 (UTC)CameraSafetyFree to use under the Unsplash License
blackdarkarchitectureshadowcoolstairsmonochromeladdertunnelfailuresinkundergroundholewater mainjapangreyspiral

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