How to build the Trample Steam in the Call of Duty Black Ops 2 Zombies map Die Rise. There are four parts are required to build the Trample Steam.

The parts can be found at the following locations:
Wire Mesh: Near the door in Spawning room or on the left hand wall through the double doors.
Motor: On the desk in front of Spawn point or through the double door near the broken wall.
Bellows/Fan: On the stairs or Under the painting through the double door.
Flag Pole: Near a chair in the spawning room or near the railings through the double door.