The Hydra Tank was an enemy created by the Agorians and encountered in the Krell Canyon. Later in the game, gray Elite Hydra Tanks are encountered that have more health and different, stronger attacks. They are found in the Agorian Arena. It was a big red machine with three serpent-like heads that were capable of releasing fire. After a certain amount its health was depleted, the robot created a forcefield preventing Ratchet from inflicting further damage, but also exposed a set of vulnerable Versa-fuses at the base of each serpentine head. At this time, Ratchet could use the OmniWrench Millennium 12's kinetic tether to pull off the Versa-fuses connecting one of the heads to the forcefield generator. When all three heads were removed, the creature exploded.