You are trapped in the slums with a malfunctioning power unit. Firing your weapon will severely drain your remaining power supplies, so to keep yourself running you will need to utilise the bootleg battery units created by the augments, but be careful, these may overload your systems, causing visual and audial glitches, potentially even hallucinations. Speaking of augments, the slums are overrun with them, and they will try to kill you. See how long you can hold out.