 Ryan makes the decision to scale the mountain the redoubt is built into, with the intent of reaching a section of corridor which has been opened to the elements following an earthquake.Ryan scales the steep mountain and makes it inside, taking more than a half-hour to recover from the subzero climb.He then makes his way into the redoubt, carefully moving past a hive of mutated albino worms, previously shown to be carnivorous and capable of burrowing through solid concrete.