Once the Slug was removed, communications were restored. ADS Cannon 48: Isaac used this Cannon to defeat the Necromorph known as the Slug which was covering the Communications Array, preventing Kendra Daniels from contacting the USM Valor.He only had to hold out until Zach Hammond fixed the automatic targeting. ADS Cannon 47: Isaac Clarke used this Cannon to defend the Ishimura against the debris from Aegis VII's Planet Crack while it regained it's orbit.There are two known instances on board the USG Ishimura of the ADS Cannons being manually controlled: Also, the controller must be cautious when firing the cannon because, unlike the ADS, they can potentially overheat the barrels preventing the cannon from functioning until cooled down. When this occurs, the hull integrity is displayed for the person controlling the cannon. However, if it is disabled, the cannons can be manually controlled. The ADS can be disabled, but not if one or more of the cannons is malfunctioning. The primary goal of this system is to automatically track and destroy debris, preventing damaging collisions with the ship. These cannons are usually put on Planet Cracker class ships in a large fixed array called an Asteroid Defense System, or ADS. A typical ADS cannon is made of two barrels that can be fired separately.
