what? dead end?

Into the upper level

are you sure they won't get injured if they would jump off? Doesn't look like a soft landing. Good idea though.

Guinea pigs have no sense of height so they could easily jump out thinking they are very close to the floor.

I love the idea though! Does it lead to another cage next to that one? We need a description really, to understand what's in the photo!

Cool, but do the live in that tank? That is not very good ventalation.