 The Zvezda project was not a separate program but part of the N1-L3 expedition program for the 1970s.The first cosmonaut landings were to be done with the LK Moon landing module of L3 spacecraft.The realization of the project depended on key parts of the N1-L3 program - the N-1 superheavy launcher, all 4 launches of which failed between 1969 and 1972.