Spurlos Verschwunden [prev. Die Entführung] [Disappeared Without a Trace prev. The Abduction]

Four strange crystals were discovered during an archaeological survey during a major construction project. Are these crystals the key to a new energy source? What did the disappearance of chemical engineer Dr. Christian Waltensberger to do with it? Only you, as a team of 2-6 scientists, have the necessary skills to solve the mystery of green mobility. Your head is required for this escape room.