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Viperfish are the eponymous creatures which have been mutated by Structure Gel. This causes them to have increased dramatically in size compared to a regular viperfish.
The Viperfish appear to have a human face fused on top of the head, them belonging most likely to their previous victims.
Viperfish swim and attack in groups, but do not touch Simon while he is near lamps. Viperfish may swim extremely close to a lantern, but will not go right next to it and will swim away. Although they are infected by the WAU, they were already predators before the A.I. made them even more dangerous by making them larger and more powerful. Although the doors to the storage crates found stranded are open, the viperfish will not go into them.
During Simon's track to Tau, the viperfish makes an appearance. Strong geothermal currents caused by a fault line activity hinder Simon's progress, making it easier for the shoal to make frequent passes at Simon in an attempt to weaken him with bites to the body.
Simon is mostly able to prevent these attacks by standing next to the erected lamps, but a stray viperfish may still attack. There are also a few abandoned storage crates scattered on the ocean floor that can be used to hide from the shoal.