From Halopedia, the Halo wiki
Codenamed 'Towers' during development, The Rig is an asymmetrical map set on a Liang-Dortmund mining rig. It is a vertically-focused map, with many nooks and crannies that players can exploit with their spartan abilites in order to ambush opponents or find efficient routes around the platform-heavy playing area. The focal power weapons are the Plasma Caster and Sniper Rifle. A Scattershot and active camouflage also spawn on the map.