Incubation Tanks A and B are a pair of objects in Metroid Prime Hunters, on the Celestial Archives in the rooms Incubation Vaults 01 and 03. They are filled with some sort of green fluid. If Samus comes into contact with either of them, she will be harmed.
Incubation Tanks A and B
Metroid Prime Hunters
Nanobot incubation tank, operating at full* capacity.
* The entry here is for Incubation Tank A. Incubation Tank B is said to be running at 67% capacity.