Undercover.

John was in the sewers, after letting Jacob go.
He was ready to kill some Parasites or Freaks after this one.
He switched on his night vision and kept walking.
He had specialized armor, those parasites werent going to bite him.
He shot off 3 rounds of silenced MP5 into a freak, killing it.

john kept moving through the Sewers, hiding occasionally from The freaks.
He moved up to The Company sewer disposal unit.
Of course, it had electric, barbed wire, razor wire, and incindiary motion sensors.
Why can't it just be iron bars anymore?
John pulled out C4 and placed it on the pipe and pulled the trigger, BOOM!
Everything exploded, and he rushed in, shooting here and there.

When John got to the top, he climbed out of the giant toilets.
He shot a company employee, who had a gun.
He reloaded and kept moving, being very quiet.
He got to the main scanner that kept everything in balance, and destroyed it.
This released the gates that keeps most of the freaks and Parasites out of the city.
The Wastelands opened up in full view, the gates falling must've been seen from a mile away.

John watched in surprise as thousands of Parasites flowed into the city.
He then closed the flood gates back up.
Then, he was hit, and gagged, and all he remembers is blackness.
And pain. The excruciating pain.

John awoke in a cell.
He was burned, and every gun had been stripped from him.
But the dumbasses forgot to take his grenades.
He saw his guns in the corner, so he blew a hole in the door and stormed out.
He jacked a car and sped off at 200 miles an hour.
He needed to get to the Wastelands.
John found a radiation combat suit in the back and put it on.