Building the final part of the line commenced shortly afterwards on the central stretch finally linking up the Zhdanovskaya line, and finishing the Krasnopresnensky radius. The former was built with two deep level column stations, one of the centrepieces was the increased diameter of the central vault of 9.5 metres, as well as the rich architecture methods used. The latter section encountered a significant difficulty when building under the Moscow Canal. To avoid flooding, boring had to be done in the winter, and a three-metre thick plane of ice had to be placed on the canal bed. Afterwards, the line continued into the northern regions of Shchukino and Tushino, including another combined railway link at Tushinskaya. The station Skhodnenskaya was another pioneering design, which consisted of a single vault technology initially developed for the Kharkiv Metro, it too became common elsewhere in the Soviet Union. Another station on this stretch was left unfinished because of the lack of need for it and remained derelict for thirty years. The station was completed and inaugurated in August 2014 under the name Spartak.