Apollo 13 was supposed to land in the Fra Mauro area. An explosion on board forced Apollo 13 to circle the moon without landing. The Fra Mauro site was reassigned to Apollo 14. They were the ones who started the popular phrase, “Houston, we have a problem.” The crew consisted of James Lovell, Fred Haise, John Swigert. It launched on April 11, 1970 from Cape Kennedy. The explosion was caused by one of the oxygen tanks blowing up and causing the other to unstabilize. This made it very hard to get home because a lack of oxygen to light the rocket fuel with and also a lack of navigational tools to do it manually.