Crawling through air ducts in Metro: Last Light
A series of small ventilation tubes accessed via a grate which wind their way through the metro, originally used to bring heated or cooled air to the people using the metro but now broken down and in shambles.
In Metro: Last Light, Artyom can crawl through the air ducts to reach new areas or even escape from predators or enemies.
During one scripted sequence, Artyom hears three guards discussing a plot to negotiate with The Order when he is crawling above them in the air ducts.
