> During the 12.6-minute-long powered descent, there were a total of five unexpected computer alarms. These alarms all indicated that Eagle’s computer system was overloaded, but in each case, Mission Control concluded that it was safe to continue the landing. The last of these alarms occurred less than three minutes before landing, when the crew was less than 500 meters above the surface. Because of the navigation error, the computer was guiding the spacecraft towards an unsafe touchdown point in the rugged, boulder-filled ejecta field surrounding West Crater. Armstrong took manual control and flew to a safe landing spot beyond the crater. At 3:17 PM CDT, he announced their safe landing, “Houston, Tranquility Base. The Eagle has landed.” At the time of landing, Mission Control thought that the spacecraft had just 17 seconds of fuel left in the descent stage. However, post mission analysis showed that sloshing in the fuel tank during Armstrong’s search for a safe landing site caused the fuel gauge to give an inaccurate reading. Eagle actually had about 45 seconds of fuel left when it touched down.
> During the 12.6-minute-long powered descent, there were a total of five unexpected computer alarms. These alarms all indicated that Eagle’s computer system was overloaded, but in each case, Mission Control concluded that it was safe to continue the landing. The last of these alarms occurred less than three minutes before landing, when the crew was less than 500 meters above the surface. Because of the navigation error, the computer was guiding the spacecraft towards an unsafe touchdown point in the rugged, boulder-filled ejecta field surrounding West Crater. Armstrong took manual control and flew to a safe landing spot beyond the crater. At 3:17 PM CDT, he announced their safe landing, “Houston, Tranquility Base. The Eagle has landed.” At the time of landing, Mission Control thought that the spacecraft had just 17 seconds of fuel left in the descent stage. However, post mission analysis showed that sloshing in the fuel tank during Armstrong’s search for a safe landing site caused the fuel gauge to give an inaccurate reading. Eagle actually had about 45 seconds of fuel left when it touched down.
https://www.lpi.usra.edu/lunar/missions/apollo/apollo_11
Apollo 13 had some very serious life-threatening problems, but almost crashing into the Moon was not one of them.