Is it a port of Thunderdome or Beyond Thunderdome? Possibly its roots go back further than Marathon.
http://marathon.bungie.org/story/pathways.html
Scott Jaeger wrote:
"You know the last level in PiD? You know, the one with the identical rooms full of monsters? Well, play a game on the Infinity net map Beyond Thunderdome. The room which teleports you to the inner ledges is suspiciously built like the PiD rooms, teleporter poly and all."
: From the Bungie.net web site: we’ve decided to make the unlockable
: multiplayer map, Foundation, available to everyone... and wanted very much
: to share Foundation – inspired by our old shoot ‘em up Marathon – with
: Halo 2 players everywhere.
: note: it was more than "inspired by" it actually *was* a direct
: port of Thunderdome that was later tweaked to give more central cover and
: work with Halo 2's physics. (The elevators were essentially player
: launchers)
: The Halo 2 autoupdate unlocks the level for everyone.