You don't need an AI to come up with remote sensing or air gap traversal capabilities though.
Note for example TEMPEST surveillance, or using a distant laser to pickup speech in a room based on window vibrations. Air-gap traversal is easily done by exploiting human weaknesses (e.g. curiousity to pick up a USB drive to see what's on it), and was successfully done by Stuxnet.
Indeed, there are lots of methods, but i was specifically thinking of the possibility of a method an isolated AI might feasibly figure out with only the tools it has easily available to it.
But as someone said earlier, the real interesting part is when/if they start figuring out novel concepts we as humans haven't even considered.
Note for example TEMPEST surveillance, or using a distant laser to pickup speech in a room based on window vibrations. Air-gap traversal is easily done by exploiting human weaknesses (e.g. curiousity to pick up a USB drive to see what's on it), and was successfully done by Stuxnet.