"Experts of the rocket and space industry, having analyzed the data obtained from the telemetry of the Nauka module, decided to schedule the flooding of the Pirs module for July 24, 2021," the state corporation said in its Telegram message.
The Pirs module will be replaced by a new multipurpose laboratory module Nauka, which was launched into orbit the day before.
Its flooding will take place in the Pacific Ocean.
According to Roskosmos, Pirs consists of a sealed enclosure and installed equipment, service systems and structural elements that provide spacewalks.
On July 21, the Proton-M launch vehicle with the Nauka multipurpose laboratory module was launched from Baikonur, which will be delivered to the International Space Station.
Its docking with the ISS is scheduled for July 29.
After the Nauka module is put into operation, the Russian segment of the ISS will receive additional volumes for the arrangement of workplaces and storage of cargo, placement of equipment for the regeneration of water and oxygen.
The astronauts will also receive a second toilet, a cabin for a third crew member and the European ERA manipulator, which will allow them to perform some work without going into outer space.