I assume you mean radio frequencies, and the answer is basically none. A grounded fireproof safe is basically a perfect faraday cage.

EDIT: Ok, I actually have a pedantic answer for this. If you put a microphone on a device inside the safe, you can signal it from outside by sending it vibrations, and you could encode a message in binary and thus technically send it a “digital signal”. If you wanted to be a little more analog you could use Morse code :)

Probably yeah. A fireproof safe will be airtight, so the system can only produce as much energy as whatever reagents you put inside.

It also says “never”, but yeah, it’s a pretty bland statement when you put the context back in (literally and figuratively).

Holy hell, the fact that those slack messages and that chatbot history ended up in court is mind blowing. I guess we should be grateful that this time, the bad guy and his hamfisted “Project X” got put in the spotlight.