Summary: Filming in the Giant Crystal Cave for 'How Earth Made Us'. One of the deadliest places on the planet. Watch a preview of the Crystal Cave sequence here.
It's 50oC and has a humidity of 100%, less than a hundred people have been inside and it's so deadly that even with respirators and suits of ice you can only survive for 20 minutes before your body starts to fail. It’s the nearest thing to visiting another planet – it’s going deep inside our own.
For 'How Earth made us' I have been lucky enough to film everywhere from tiny Pacific islands to the centre of the Sahara desert, yet nowhere could prepare me for filming in The Giant Crystal Cave - Cueva de los Cristales of Mexico.
Probably the most incredible photograph of the cave ever taken. Photograph by Carsten Peter/Speleoresearch & Films. Published in National Geographic.
Go read the whole thing.