there are many american stories about those terrible Cu Chi tunnels.
they used to called conditions in them: "Black Echo".
like in an earth coffin.
it was low on air, food and water and a lot caught malaria, especially when they had to go on for days within them.
the bombing was the first cause of death when america soldiers came out, the second was malaria.
a lot of vets said it felt like they were buried alive in those longs days under the ground.
now we can laugh about it of course... by the way... for a second it kinda looks as if they are burying you there :)