The Zerg Nydus Worm is a massive, organic transport unit with a segmented, cylindrical body that tapers at both ends. Its exterior is covered in thick, chitinous plates with a rough, textured surface, featuring deep grooves and ridges for added durability. The worm's maw is lined with rows of sharp, bony protrusions, and its body exhibits a dark, purplish hue with bioluminescent veins that pulse with a faint, eerie glow, signifying its connection to the Zerg hive mind.