The excavation of the right tube of tunnel of connecting Big Circle Line (BCL) of the metro and the Zamoskvoretskoye depot has been completed.

TBM Marina (6 meter diameter) completed boring 824 metres in depth 5-22 meters underground.

The Big Ring Metro project is largest metro construction in Mowcow history. 70 kilometers and 31 stations. BCL will connect all radial lines up to 10 km from the existing Circle Line. The first section from Petrovsky Park to the Business Center was opened in February 2018.  All will finish in 2023.

https://realty.interfax.ru/ru/news/articles/123852/