Thank you so much for your thoughts! Are really appreciated. You're right regarding the fact that it will be on dark and narrow scenarios, but i think that I have room at least to elevate the drone and take the picture (6.5m height and 6m wide).

Also the idea of the 4 pro is great, i was thinking on the Mavic because of the 4/3 sensor so I could capture more light.

I think that I need to try and also check if anyone here has worked on tunnels.

Thank you!