On the level Cairo station, at the end of the end of it {at the bomb part} walk out of the lift.Then, turn right into the shadows, then walk up the stairs. At the top, there is a piston moving along the floor. This is the MAC gun{that was just some info.)Then walk to the other end of the floor to where the piston falls, walk under it and wait.When the piston falls on you, it pushes you through the deck,trough space and into the other part of the station, on another deck.By the way, it kills you.