Portal 2 Rat Man Transmissions
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Hidden within the depths of Aperture Laboratories are the secret dwellings of Doug Rattmann, the last surviving Aperture Science researcher and an escaped test subject of the homicidal AI construct GLaDOS. He didn’t have the benefit of our Portal 2 FAQ, but he seems to have done okay.
“Rat Man” has a story that intertwines with that of Portal and Portal 2 protagonist Chell, which can be found in Valve’s comic “Lab Rat,” and he also has left drawings all over his hidden rooms. That’s not all he’s left behind, either — in two locations in the hidden Rat Man Dens are secret transmissions.
The first signal is accessible when you snag the “Final Transmission” Achievement/Trophy. You’ll have to get to the Rat Man Den #3, the instructions to which are found in our Portal 2 Rat Man Dens post.
The second signal is accessible if you turn on Valve Developer Commentary and go to Rat Man Den #6. If you access the commentary node while you’re in the room, you’ll hear the second signal.
Decoding the Signal
What you’re hearing — bursts of sound that kind of sound like 56K modem noises — are called SSTV signals. If you record them, you can decode them with SSTV software you can find on the Internet. We used the freeware found here.
If you can manage to record the sound from the transmissions (I’m using my iPhone, which is in no way ideal, but it is quick and easy) off your TV, play the recording into the mic on your laptop, the software will decode the sound into images.
Try it yourself! Or check back when we get our own transmissions decoded!
Here’s the one from “Final Transmission,” care of the Valve forums:
Lost in GLaDOS’ evil funhouse? Consult our game guide for solutions to all of Portal’s puzzles. Unlock a few accouterments for Atlas and P-Body with our PC Unlockables List and reshape the game to your will by accessing our Developer’s Console Command List, and our ever-growing Achievement Guide and Trophy Explanations. Plus, there’s more content hidden in the game than you can shake a robotic wood-like branch beam at.