One of the Astrobiology Academy students realized that the first letter indicated which ground station recorded the data on the tape in that container: "M" indicates that the tape was recorded in Madrid, Spain; "W" indicates that the tape was recorded in Woomera, Australia; and "G" indicates that the tape was recorded in Goldstone, California. This guess was confirmed when the team listened to the audio track at the beginning of a few of the tapes, wherein the operator of the ground station recites information about the tape and the recording. On tapes marked with an "M", the operator has a distinctly Spanish accent. On tapes marked with a "W", the operator has a distinctly Australian accent. On tapes marked with a "G" the operator speaks with an American accent. Sometimes audio track captures an operator at one tracking station talking to an operator at another tracking station. Each tape's opening audio includes the date that the tape was recorded in both local and Universal Time. There are many other confusing problems with the tapes. Each tape is supposed to hold a complete pair of images, but some contain just a few minutes of audio signal, and some contain the same tiny portion of an image, over and over. In the early stages of the project, the team wanted to rescue images that have the most value and impact, but they found that it was very time intensive to find images in this disordered array of tapes. In a completed and working magnetic tape drive system, the tape-drive heads apply a very specific magnetic field to the tape; the tape then induces a change in electric current, which is captured. The data from the Lunar Orbiter tapes is then run through a demodulator, and through an analog-to-digital converter so that it can be fed into a computer for digital processing. Each image is divided up into strips on the tape, so the computer is used to bring the strips together to create a whole image. Before even beginning the project, the team evaluated the risks and determined that there were two: one was that the tapes had deteriorated to the point where they could not be read; the second was that the tape drives would not be able to read the tapes. The milestones of the project were developed to test these risks as soon as possible with the least amount of money spent. Once the project started in earnest in July 2008, results came quickly. In only a couple of weeks, the first tape drive had been powered up, although it was clear that many parts still needed to be replaced. Another week of cleaning and testing revealed that among the four drives and batches of spare parts there were enough good power supplies to run one of the tape drives, and there was at least one working head for the drive.