Fred Haise first hailed Houston from Apollo 13, but it was Jim Lovell who spoke the now-iconic line.

"Houston, we've had a problem. We've had a main B bus undervolt," Lovel said on the second day of the mission to the moon.

The crew of Apollo 13 never made it to the moon. But now the entire transcript of their conversation with NASA, along with the radio transcripts of other early space ventures, are now available online.

Andrew Godwin, a British programmer, launched Spacelog.org to publish the radio transcripts of the earliest manned missions to space.

The site allows visitors to search, browse and link back to specific portions of the transcripts of each mission.

Apollo 13's oxygen tank ruptured just after 3 a.m. on April 14, 1970 while the crew was over 321,000 km from Earth. The emergency and subsequent rescue effort quickly became legend, and was eventually made into a film starring Tom Hanks in 1995.

Currently there are only two missions available to read on Spacelog.org: Apollo 13 and Mercury 6, John Glenn's famous trip as the first American to reach orbit.

Coming soon is Gemini 7 (first orbital rendez-vous), Apollo 8 (first human space flight to leave Earth's orbit) and Apollo 11 (first landing on the moon).

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