This phrase, supposedly uttered by Apollo 13 commander, Jim Lovell was, in its original rendering: "Houston, we've had a problem. We've had a main B bus undervolt." However, the first notification to Houston that there was a problem was by fellow astronaut Jack Swigert, who used almost identical words. The official NASA chronology [7] lists the messages as:

55:55:20 – Swigert: "Okay, Houston, we've had a problem here."

55:55:28 – Lousma: "This is Houston. Say again please."

55:55:35 – Lovell: "Houston, we've had a problem. We've had a main B bus undervolt."