"electrical smell", "burnt almond cookie" is the smell people who survived report HCN to have. And it's not that space is full of a lethal-on-touch gas, that's

"electrical smell", "burnt almond cookie" is the smell people who survived report HCN to have. And it's not that space is full of a lethal-on-touch gas, that's the smell your nerves report when the sensory cells are dying faster than they can pass on a chemical signal.