See Venetian Gladiator for more info. This tomb is located in Venice, and is different from the other tombs you will go through. Instead of working your way towards the end of the end of the area, the game will put you smack dab in the middle of the building. You will have four switches you can step on, that drops a lever down that you must reach before the time runs out. Whenever you first step on a switch, watch the way the camera pans, as that is the path that you will have to take to reach the lever.