On December23, 2021 at 02:03 Moscow time the propulsion section of the “Progress M-UM” unmanned supply spacecraft was undocked from the International Space Station. At the same day, the propulsion section was deorbited. Non-burnt fragments of the “Progress M-UM” propulsion section drowned in the remote area of the Pacific at 07:30 Moscow time. The undocking of the propulsion section revealed the Prichal's nadir docking port for future Russian spacecraft. “Prichal” is a new nodal module (the spherical, ball-shaped docking node) that has a pressurized spherical ball-shaped design with six hybrid docking ports.