Where was The Tunnel (2016) filmed?
Wikidata records no filming location for The Tunnel (2016) at all, not a place, not even a country. There is nothing to pin, and this page says so rather than guessing.
From published sources
Places named by newspapers, film offices, archives and city filming permits. Each source is linked.
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Towns & cities
Sangam-dong
South Korea
Neighborhood in Mapo-gu, Seoul, South Korea
Film archive record: DMC첨단산업센터, 서울특별시 마포구 성암로 330 Korean Film Archive
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Towns & cities
Jung District
South Korea
Film archive record: 서울특별시 중구 봉래동2가, 서울특별시 중구 한강대로 405 Korean Film Archive