The archaeologist Martin Garrett also got trapped in the Labyrinth
Somehow, he's got the card key for the teleporter in his wardrobe in his room in the hotel. He could only get that by time travel as it's an item from the future. When the labyrinth was created, he got trapped in it, and eventually died there.
Where's his body? Possibly he fell down one of the many bottomless holes, or maybe he met Minos and was destroyed completely. Or maybe he's stuck behind the unopenable doors in the ziggurat or train.