It breaks under pressure, and then melts once it's broken. It used to be indestructible to pressure and heat, but isn't now (I think so bombs could destroy it better)

I remember when it was changed so that it could be destroyed by pressure, it messed up one of my saves and I had to add a bunch of protection around the wifi because of the extreme pressure and heat near it. There wasn't TTAN back then (which i'll probably use when/if I publish it).

There is a reason it was changed though. Before, when using bombs on cities, the only thing that would be left is the wifi. It was changed to fix that. It's easy to add TTAN next to it now, so it isn't a big problem anymore.