A much improved Soyuz program emerged from this eighteen-month delay, mirroring the improvements made in Apollo program after the Apollo 1 tragedy. Although it failed to reach the Moon, the Soyuz went on to be repurposed from the centerpiece of the Zond lunar program to the people-carrier of the Salyut space station program, the Mir space station, and the International Space Station. Although it suffered another tragedy with the Soyuz 11 accident in 1971, and went through several incidents with non-fatal launch aborts and landing mishaps, it has become one of the longest-lived and most dependable crewed spacecraft yet designed.