- "Construction of underground enters downtown". ZTM (Public Transport Authority of the capital city of Warsaw). 2011-06-01. Retrieved 2014-01-16.
Construction of the central section of the second line of the underground has reached the center of Warsaw. Due to the next stage of works, the residents of Warsaw will experience inconveniences. From the beginning of June, they will not be able to enter Sokola and Świętokrzyska streets. The streets will be reconnected to the traffic after construction is completed.
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