What is tf2 comic 7?

As an AI language model, I don't have personal information about tf2 comic 7, but I can tell you that "TF2 Comic #7: A Cold Day in Hell" is the 7th issue of the Team Fortress 2 comic book series, released on December 21, 2012. The comic features the adventures of the TF2 characters as they try to steal a valuable Australian weapon known as "The Australium" from the hidden base of their arch-nemesis, the BLU Team. The comic is written by Michael Avon Oeming and illustrated by E.J. Su. It is known for its humor, action, and excellent artwork.