I randomly found this SSTV audio file while playing Commentary Mode earlier, I know it had been found a few minutes before, but I havn't seen any videos of it, or it's location. So here it is!
Heres a link to a page with the decoded SSTV images.
http://valvearg.com/wiki/Com-arg.wav
If you're wondering where this is, it's the final test chamber before the start of Chapter 4.
