Conversation so far:
where did apollo 13 land on the moon?
The Apollo 13 Lunar landing was aborted after an oxygen tank in the service module failed two days into the mission.
what did the crew of Apollo 13 do instead of land on the moon?
The Apollo 13 crew instead looped around the Moon, and returned safely to Earth on April 17, 1970.
who commanded the Apollo 13 mission?
Jim Lovell
who made up the rest of the crew of Apollo 13?
Jack Swigert as command module pilot and Fred Haise as lunar module pilot

Question: what caused the oxygen tank failure?
Self-contained rewrite: what caused the oxygen tank failure during the Apollo 13 mission?