Our walkthrough describes exactly how to do so.
Explore the underground area
Explore a small area to the side before moving further.
You’ll find asecret chestthere, as pictured above.
Jump down to the lower levels.
You’ll reach a locked gate and findtanks filled with greek fire, that is, copper.
Sophia will let you know they can be detonated.
The explosion will blow the gate open.
In this area it’s possible for you to find aworkbench.
In the place pictured above you canblow up another copper tankhidden behind the boards.
This unlocks a passage to a new area, hiding afeather for Hugo’s Herbarium: European Goldfinch.
The explosion will unlock a new passage.
In the new area turn left and head uphill towards the large cart.
Walk underneath the damaged grate anduse the crank.
Raise the grate and the cart will start rolling downhill.
This unlocks the way forward.
There’s apuzzleyou must complete.
You must create a safe way forward to the faraway bridge.
Rats will be getting in the way.To solve the puzzle you must use three nearby carts on rails.
First, head towards theright carts(looking towards the exit).
you could reach it by asking Sophia to refract the light with her prism.
The carts can be pushed, but only on rails.
You may need to push them in different directions depending on your need.
Move the cart near the side area pictured above.
You’ll find asouvenir: Chateau d’Ombrage.
You must now safely return to the higher level.Shoot the burning basket inside the cart with some tar.
This will give you enough time to climb up and return to it.
There’s ananchor pointin the center.
Stand next to it andaim your crossbow at the left cartpictured above.
Grab onto it and pull it a bit closer.
Start moving the left cart along the rails.

Take it towards the cavern exit and stop once the rails end (pictured above).
From here you’re free to detonate a copper tankpictured above with an Ignifier.
After the explosionreturn to the starting point, that is, the central circular platform.
Thanks to the explosion the way forward is now available.
At the first fork,turn left, then right.
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