Technology & Combat Characteristics
The Grublo is an underwater mobile armor used by Zeon. It can deploy a pair of arms for combat, and they are retracted for storage when the the machine is in cruise mode. Its armament consisted of a large plasma cannon in its "mouth" section, two arm-mounted plasma cannons, and 24 torpedo launchers on the upper section of the mobile armor.
History
A Grublo, belonging to the Kaufmann team, engaged the RX-78AL Atlas Gundam near the oceans surrounding Antarctica to stop it from pursuing the Zeon remnants' Mad Angler-class submarine. Despite having huge firepower, the Atlas Gundam managed to dodge or block all of its attacks, however the Grublo's torpedoes reduced the Gundam's vision due to bubbles produced by their detonation. This allowed the Grublo to close in and engage the Atlas Gundam in melee combat, dealing heavy damage by grabbing it with its large claw arms. Although Bull intended to use the Grublo's large plasma cannon as a trump card while the Atlas Gundam was immobilized, Io Fleming saw through his tactic and sacrificed the Atlas' Sub-Legs and the Blade Shield, taking the Grublo out by destroying its cockpit with its Beam Saber. The defeated mobile armor then sinks, and implodes, as it is crushed by the water pressure.