In my last year of high school, myself along with three classmates competed in the Weizmann International Physics Competition. The goal of the competition is to create a themed safe that can only be unlocked after the opposing team completes two puzzles based on physics principles. We designed our safe to be Thor’s hammer; there was a 600 lb electromagnet fixed to the bottom so that the opponents couldn’t lift it until they solved the puzzles. My team moved on from the national competition in Montreal to compete in Israel for the International competition where we came in first out of 144 teams.
See the attached article: Champions of Safe Cracking