AFAIK, the ISS needs to be de-orbited over an ocean, burned up, and replaced. (like the plan was from the beginning) There are a number of scary mould patches

AFAIK, the ISS needs to be de-orbited over an ocean, burned up, and replaced. (like the plan was from the beginning) There are a number of scary mould patches up there, and potentially other pathogens, with no real way to properly clean the whole thing.