Escape the base
As the dust settled, Master Chief climbed out of the wreckage of the service elevator he had escaped the explosion in. As he took in his surroundings the Chief noticed about 7 other marines, his new objective was to get them away from the base to safety. Luckily, in the next room there were two warthogs, exactly enough to carry all the marines and the Chief. As one marine went to open the door leading outside, the Chief and marines climbed into the Warthogs, with Master Chief taking driver's seat of the Warthog with the turret, taking control of the small convoy.
Outside the door was a short cave leading outside, as soon as they had reached the mouth of the cave, the convoy came across Covenant, fortunately it was only Jackals and Grunts so they didn't have to leave their Warthogs, instead they just ran them all down to avoid wasting ammunition. After exiting the cave, the devastation of the explosion was clear, there was debris everywhere and the Covenant were in full swing searching for survivors. However they were no match for the turrets mounted on the Warthogs and those that didn't get shot down got ran down.
As the Chief and marines made progress getting away from the base the Chief heard a transmission. There was a convoy that were pinned down at a small settlement east of the town of Voi, they needed assistance so this was now the Chiefs new objective. On the way to the settlement the convoy had to cross a bridge, however about halfway across there was a break in the bridge. The only way across was a steal beam, barely wide enough to walk on, from this point they had to leave the Warthogs and walk.
As the chief approached the settlement he received communication from Commander Miranda Keyes "Truth has uncovered a Forerunner artefact, we can only assume it's the ark." The Chief then hear from Johnson "keep pushing to the town of Voi Chief, re-supply birds will meet you there." When the Chief got to Settlement he was met as expected by an arsenal of Covenant, but this was no bother to the Chief, with his Assault Rifle, a Shotgun, and the backup of his marines the Covenant we're not outnumbered but they were outmatched. Within minutes the covenant were defeated, even when more Brutes and a Wraith arrived they were soon defeated. Once the Covenant threat was dispatched a Pelican arrived with a Warthog to help the Chief and marines continue pushing towards Voi.
As soon as the Warthog was dropped the Chief took driver's seat yet again and two marines took place as gunners. From here the Chief kept pushing towards the Osama Highway leading towards Voi, on the way fighting against Brute Choppers and more Wraiths. When the Chief finally reached the highway he was met by more brutes. This time the Chief was outnumbered severely, and the Brutes put up a good fight. But the Chief and Marines had the edge in skill, and this is what would bring them to defeat the Brutes yet again. Now the Brutes were eliminated all the Chief had to do was wait for Pelicans to pick up the marines.
As pelicans arrived Commander Keyes saw that the Ark was fully uncovered, a sure sign that time was against them, however Lord Hood on communication with Commander Keyes was confident that Humanity would Prevail. "The Prophet of Truth doesn't know it yet, But he's about to get kicked right off his Throne. You will take our city back. And drive our enemy into the grave they've been so happily digging! One final effort is all that remains!"