Structure gel is a black, liquid substance that is found throughout PATHOS-II. It was introduced to the facility around the turn of the 22nd century and subsequently calibrated to be used by the WAU for a variety of maintenance and construction roles.
As experienced throughout SOMA, structure gel is an essential material for the machines of PATHOS-II. Personnel often treated the pre-WAU robots with the gel to maintain them.
Structure gel is a highly proteinated, cross-linked lubricant, conductor, signal medium, with aligned graphene in a petroleum monosubstrate, polysaturated matrix, containing fuel oils, and can be encoded with instructions. The gel can be calibrated to accomplish a specific function.
The substance is very useful in technology, able to connect different forms of machinery and even increase the functionality of basic machines immensely. The gel can reboot any offline machine and repair any structural or electrical damage. It can even bring biological life back to a "sleepwalking" reanimated state, using electrical impulses both to guide the pseudo-organism and to prevent the gel from hardening. Even human bodies can be "revived" this way.
Structure gel is harmless to humans in small doses but large doses cause nausea and possibly a state of coma, there is no treatment for over-exposure.
All of the structure gel in PATHOS-II was linked to the WAU, which gave the A.I. complete control of any machine or structure infused with the gel.
In 2103, the WAU calibrate the structure gel in such a manner that doesn't necessarily make sense, it acted as a cancerous growth when used. The WAU then caused the gel to overflow Pathos-II; bursting through pipes in walls or floors or ceilings and covering machinery.
- On the bottle of structure gel is a label denoting hazards, production number, and a QR code. If scanned, the QR code says "structure gel 023343".
- Although structure gel is black in color, it often has blue-tinted lights coming from small nodes in it. This is similar to how certain aquatic organisms can exhibit bio-luminescence.
- At one point, Simon comes across a deceased rat inside a specimen chamber with a structure gel dispenser. Infusing the rat corpse with gel causes it to reanimate, squirming and squeaking unnaturally. Simon remarks: "It came back to life... or at least something like it."