You slam the time machine door behind you and it immediately starts up. You've altered the first event in history and stopped World War 1 and who knows how many others. A panel on the wall lights up with a date. Tuesday, January 28, 1986.
Something very specific happened on that date and you need to stop it. The explosion that took place may have been avoided with a slight change in code. The control panel, which is securely locked, can be opened by a name. Once inside, a code will prevent the disaster. Make sure, there are no gaps and the digits will be right. Good luck with your mission.