We plough through dust, skim under wooden beams, take a sharp turn upwards and enter a dim chamber.
We stop. The mouse twitches its tail.
I release my grip and the mouse runs off. My heavy breathing echoes in the chamber.
As my eyes grow accustomed to the darkness I see what look like iron rails bolted to a metal plate. The rails shoot up at an angle into the darkness.
I decide to climb.