A photo of the actual crate he stowed away in (his rescuer is in the crate):
https://ichef.bbci.co.uk/news/976/media/images/82156000/jpg/...
From this 2015 article: https://www.bbc.com/news/magazine-32151053
It really helps to picture being stuck upside down in the thing. I thought, “surely you could gradually rotate yourself the right way up” before I saw the photo.