Scp 079

Scp 079 is basically a sentient computer. Personality:079 will randomly close doors however that's not all, if you manage to get the remote door control system turned off (how 079 is able to shut doors) and talk to him he will make a negotiation with you asking you to re-enable the remote door control system, after doing this going near gate b will automatically have it open as before he asked you to activate the remote door control system and in return he'll open gate b, also gate b has no keycard reader so that's the only way to escape using gate b.