Mounted on rugged track units, Thunderfire Cannons can traverse almost any terrain to reach the optimum firing position. Though they can move under their own power, they are normally deployed from Thunderhawk gunships or by Drop Pod. Each Thunderfire Cannon is tended to by a single Techmarine who uses his bulky Servo-harness to reload the artillery piece whilst calculating optimal firing trajectories. The Techmarine manning a Thunderfire Cannon can set its shells to detonate in a variety of different ways, depending on the tactical situation. Surface detonations are employed against numerous enemies in comparatively clear terrain, airburst shells are used to scour a foe from cover, and the Techmarine can even program the shells to burrow deep into the ground before detonating; though the f