Watch The Secrets of the Colosseum Full Movie Free Online 123Movies. Sea battles in the morning and gladiator fights in the afternoon with wild beasts magically appearing in the arena? A subterranean archaeologist investigates tunnels to see how the Colosseum could be flooded; and architects, engineers, and builders construct a lift and trap door system to attempt the release of a wolf into the most famous amphitheater in the world for the first time in 1500 years.