The Infested Hydralisk Den is a grotesque, organic structure resembling a mutated version of the standard Hydralisk Den, with pulsating, veined membranes and jagged, bony protrusions. Its surface is covered in a slimy, dark carapace with patches of glowing green Zerg biomass, indicating active infestation. The den features multiple entry points shaped like gaping maws, surrounded by spine-like appendages that twitch occasionally, adding to its eerie, living presence.