Out of all the pictures I've seen this one is the most graphic for me in showing how lucky Grosjean was.
Looks like a very tight squeeze to climb through between the halo and the track barrier and that's ignoring he's just survived a +50g impact, gone through steel guard rails and is on fire
Been some amazing safety advancements in F1 over the years but there is always ways to improve safety. I'm sure a lot of lessons will be learned from this crash once the FIA have gone through everything