The first plans to construct the metro line emerged in the 1970s and 1980s, with a view to construct M3 between
Okęcie and
Ochota with
Gocław and
Julianów. Later on, plans were changed, with the connection shortened to one between Okęcie and
Warsaw West railway station. Plans were shortened once again, with the final draft of the line covering stations from the
National Stadium to Gocław. In 2015, Warsaw city authorities planned for the construction of the M3 metro line between Stadion Narodowy and Gocław to commence in 2020. In 2018,
Civic Platform's
Warsaw mayoral candidate
Rafał Trzaskowski declared, if he won the upcoming elections, the construction of the M3 metro line would begin before the end of 2023. In May 2019,
Warsaw Metro declared a tender for completion of a technical study of the route of the M3 metro line, including the construction of the Kozia Górka technical and holding station. The technical study would analyse the proposed route and the preferred location of stations of the first section of the metro line between Stadion Narodowy and Gocław. On 26 June 2020, the results of the technical study and proposed route were published. The same day, Warsaw Metro announced that the technical study only encompassed the first section of the M3 metro line. The metro line might be extended across the
Vistula and link to the
M1 metro line around the
Racławicka metro station. The construction of the M3 metro line formally began on 15 March 2021. ==Stations==