When does the rocket take off on cod black ops zombies ascension?

To launch the rocket on Ascension you must:

1. Turn the power on (in the area where the random box starts)

2. Use all 3 lunar landers

3. Go back to the power switch area and pull the lever.

After the rocket launches the Pack-A-Punch machine will become open.

NOTE: You can destroy the rocket with a Ray Gun or a LAW but there is no point as it does not give you anything.