Your mech powers down to guard mode in the shadows of The E…

Your mech powers down to guard mode in the shadows of The Edge Bar's service alley. The laser katana's familiar weight settles against your back as you approach the vent, steam from the noodle stand curling around you. The rusty grate comes loose with a practiced twist - too small for humans, perfect for a meerkat.
The first section of tunnel slopes steadily downward, your claws finding purchase on the corroded metal. The interference in your quantum processor grows stronger with each careful step, a familiar resonance that makes your whiskers twitch. Ancient maintenance markings guide you deeper into Golgotha's underground arteries until you reach a junction that opens into what must have been a primary service hub.
Three paths branch from here:
A maintenance shaft where metal panels have peeled away, exposing a mesh of live power conduits. The electricity arcs occasionally, but the gaps between panels look just wide enough for a careful meerkat. The interference signal is strongest here.
A sewer maintenance tunnel, where pressurized water rushes through a narrow channel along the bottom. The current looks strong enough to sweep you away, but there's a maintenance pipe running along the ceiling. You'd have to traverse hand-over-hand above the rushing water - one slip and you'd be carried who knows where.
A vertical drop through deteriorating ductwork. The old metal groans under its own weight. A risky climb down, but your claws and agility could manage it. The echo suggests it connects to a larger space below.

The faint thrum of active systems pulses through all three paths (#1 being strongest). Which way will it be?