Kratos killing enemies to raise the pillars.
The Bridge of Hades is found at the end of the Path of Hades.
It is a long straightforward "bridge" consisting of nearly a dozen small, round pillars. On the platform before the bridge, Kratos must kill about a dozen Hades Satyr in order to raise the pillars. A rope leading topside is suspended at the end of the pillars, allowing Kratos to climb out of the Underworld.