Explosive traps rigged at the corners of every other descending ramp in Larracos, to be blown if the enemy gets in.
Moving to the first off-ramp down from ring 50, Carl pauses when he sees traps glowing ominously at the corners. Arief follows his gaze and says simply, "Explosives. In case they get in." He adds that they have them on every other down ramp throughout Larracos.
The traps are part of the awakened city's layered defense, alongside the City Defense System that Arief says will keep the Reavers from repeating their old trick of jumping down the center of the funnel with invisibility and Fall potions. Carl notes them, then keeps walking and gawking at everything, filing the city's engineering away as important to understand.
Traps glowing ominously at the corners of the descending off-ramps between rings.
Denial charges meant to collapse the city's descent routes if invaders break through.