Getting warthog to the 3rd floor temple (Sanctum)

I was watching a video on YouTube and I saw two guys somehow bring a warthog up to the 3rd floor of the temple and I was just curious how to do that, thanks.

Use the stairs inside the Temple as a ramp to get on the platforms where the lift is that takes you to the 3rd floor. It can be tricky to pull off. If playing firefight there is a additional lift that will launch you to the 3rd floor.