Halo: The Master Chief Collection

Halo: The Master Chief Collection

Halo CE: REBALANCE
2nd Level "Halo" Teleporter button?
Has anyone found what activates the teleporter under the tunnel jump shortly after getting the warthog? I played through this mod by myself a while ago but recently started a playthrough with my cousin. I'm trying to show as many of the new secrets with them as I can as I feel i found many of the others. This one is stumping me tho. Any info is appreciated.