Foundry

Foundry is a multiplayer map to be released for Halo 3 as part of the downloadable Heroic Map Pack. It will be available on December 11th, 2007. It is primarily intended as a forge map, and almost all features of the map are non-static and forgeable. New to forge is the ability to add walls, fences, stairs, bridges, tunnels, and man cannons have been confirmed along with all the original fun of forge maps

Trivia
There is a crane on this map, as well as two shipping areas: A and B. Most of the boxes have "P425" printed on them, indicating possibly that that section of the foundry is Section P425, or it could be a serial number of some sort.