But to return to the title, by some miracle of modern engineering, on the largest ship hull ever assembled, it needs to be large to cram everything in to what is still a very confined space, one functional asset is in turn a shipping terminal, a storage facility for huge amounts of hydrocarbons, a hazardous substances plant producing LNG and LPG, a wellhead and gas treatment plant, an airport, and a hotel housing over a hundred persons. Although LNG is not toxic, it is classified as a hazardous substance by international convention because it is cryogenic, and also produces large flammable vapour clouds in the atmosphere if it is released when evaporating back into its natural state as methane gas.