The background is a 3D photogrammetry model from Archeomatique which is freely available on Sketchfab website (https://sketchfab.com/3d-models/realite-sortie-de-secours-angouleme-16-8a2575ca699549acb14bf8c23edd9bf4).
Designer : Marc-Antoine Mathieu.
Design and production : Citecreation
Year : 1999

Translation of the speech bubbles:
(1) Reality. Emergency exit.
(4) So? Do you see anything?
(5) Yes... Look!
(6) Mmm... That's what I was afraid of!!!
What ? Another underworld?
(7) Worse than that! It is reality!!