Apollo 1 landed on the "failure path". Neil Armstrong noticed that the target was a boulder field, took manual control, discovered his new spot had a crater, an

Apollo 1 landed on the "failure path". Neil Armstrong noticed that the target was a boulder field, took manual control, discovered his new spot had a crater, and finally found level ground. They had low fuel but not dangerously low. If Apollo 11 had followed the "happy path", they would have crashed and died. Hubble was also the "failure path". The main mirror was flawed and had to be corrected.