"Its pretty simple to make, you just need to coordinate the grates so when the ceiling grates open the wall grates close and vice-versa while also installing a pumping system to create a cycle. Remember to make the platforms the pumps are sitting on made of obsidian, including the furniture in the cage.

However I recommend you close the ceiling grates before they come back up and restart the cycle, otherwise the zoologist will die and we want to extend the pain for a long time."