This buildings are the defender buildings of the Zerg race against threats available from the groundi.The sunken colony has root from the creep colony and activated after the Spawning Pool mutation.The sunkens net damage is 40 points but if the target is moving the damage point can be decreased.Sunkens has some bonus against organic units.At the early stage of a standard multiplayer game a few sunkens will be a nightmare for your rival.But do not think that lots of sunkens are always good.Dependent to the nature of the game, there is never a fully corrected solution for preventing an assault.Here think strategically and do your movements.The game awaits..