Made by SA007, a bomb suitcase. It is a devious puzzle, which you have to solve by defusing the "bomb" within a 5 minute time-window. After that, it will go off and "explode". Various triggers and switches will set it off prematurely when incorrectly handled. You are allowed to use anything found inside the case plus basic lock-picking tools. It'll beep ominously and also more frequently as the countdown approaches zero and tension rises. It is impossible to get it right on the first try and you will probably hear lots of explosions.