A stream of molten rock, otherwise known as lava, flowed between the planet Nevarro's terrain and the city's underground sewer system.
This starship initially materialized in the eighth episode of The Mandalorian, a TV show created by Jon Favreau in 2019. Design supervisor Doug Chiang cleverly conceived Nevarro's lava river tunnel system to mirror the human respiratory system; he designed two tunnels that extended further into the sewers, resembling lungs, and a single tunnel that led outwards toward the light, analogous to the mouth or eye.