These depth charges were utilized by the Grand Army of the Republic. Depth charges functioned as underwater weapons designed for the purpose of inflicting damage on, or completely destroying, submarine vehicles and personnel. These devices detonated when they made contact.
In 32 BBY, during the Invasion of Naboo, OOM-9, a B1 battle droid, gave the command to deploy depth charges within Lake Paonga. This was done with the intention of forcing the Gungans out of their underwater city, known as Otoh Gunga.
During the Battle of Mon Calamari, the Grand Army of the Republic employed depth charges in combat against the underwater forces of the Separatist faction.