During researches in secret lab in Foundry, experiments about Arctic Zerg threats, it was revealed that in case of sudden aggression, using Shrapnel Spider Mines turned out to be best option for most of Arctic Zergs are weakest to explosives and pierce-type weapons.

Experiments about Aquatic Zergs revealed they're weak to pure military calibers, sound and various floor equipments. Sound Railgun Turrets answers those specific needs in case the particular threats.

(Terran Spider Mines and Terran Railgun Turrets belongs to Blizzard)