Mr Loh said in a statement that the hospital had put her on "maximum artificial ventilation support, optimal antibiotic doses as well as stimulants which maximise her body's capability to fight infections".
Though it was intended as a temporary shelter, its amenities were impressive: some 600 above-ground doors from which someone can enter the underground city from, 15, 000 ventilation ducts to provide fresh air, as well as multiple wineries, cellars and a complex network of passages, tunnels, and corridors.
Helsinki Airport, for example, has cut its carbon dioxide emissions by nearly 2, 500 tonnes compared to 2011, by making heating, ventilation and lighting more energy-efficient, as well as using electrically-operated vehicles.