Start a two-person co-op session on The Silent Cartographer. Make sure that you get the Warthog. When you reach the spot that is too tight to fit the Warthog through, have one player drive forward. The other should melee the Warthog's bumper, allowing it to squeeze through. Once the Warthog is through, continue to the peak. Have one player man the turret; the other should jump on top of their head, and then up .