Tunnel under Martwa Wisła
The 417th longest tunnel in the world
The Martwa Wisła Tunnel (Polish: Tunel pod Martwą Wisłą), officially the Father Archbishop Tadeusz Gocłowski Tunnel (Polish: Tunel im. Ks. Abp. Tadeusza Gocłowskiego), named after Tadeusz Gocłowski, is a road tunnel below the Martwa Wisła in Gdańsk, Poland.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).