Explosion forced Apollo 13 to circle Moon, abort landing
The third Moon landing mission was aborted after an oxygen tank exploded onboard, two days after launch on April 11, 1970. The crew called NASA's ground control saying "Houston, we've had a problem..." and used their Moon landing module as a "lifeboat". Apollo 13 was classified as a "successful failure" as the three astronauts safely returned after orbiting the Moon.