Moscow police have detained more than 200 illegal migrant workers found in an underground "town" hidden beneath the capital's Cherkizovsky Market.
The workers were apparently locked inside the vast complex to produce clothing.
Russia's Interior Ministry released a video of the raid on June 4.
The footage showed a subterranean factory containing work rooms filled with sewing machines, along with living quarters, a cafe, a cinema, a casino, and a chicken coop.
The migrant workers appeared to be Asian.
In another raid on June 4 in the city of Obninsk near Moscow, police found 450 immigrants from Vietnam in an abandoned hangar, where they lived and worked on sewing clothing.
Last week, Moscow police carried out an operation that resulted in the detention of 952 suspected illegal migrant workers, the majority of whom were from Central Asia.
Based on reporting by Reuters, Interfax, and RIA Novosti