Cellars
Cellars have always been much more important in Continental Europe than in the United Kingdom, and especially in Germany almost all houses and apartment blocks have been and still are built with cellars. For this reason, air-raid precautions during World War II in Germany could be much more readily implemented by the authorities than was possible in the UK. All that was necessary was to ascertain that cellars were being prepared to accommodate all the residents of a building; that all the cellar hatch and window protections were in place; that access to the cellars was safe in the event of an air raid; that once inside, the occupants were secure for any incidents other than direct hits during the air raid; and that means of escape in case of a real emergency were easily available.
However, the inadequacies of cellars and basements became apparent in the firestorms during the incendiary attacks on the larger German inner cities, especially Hamburg and Dresden. When burning buildings and apartment blocks above them collapsed in the raging winds (which could reach well over 800°C), the occupants often became trapped in these basement shelters, which had also become overcrowded after the arrival of inhabitants from other buildings rendered unsafe in earlier attacks. Some occupants perished from heat-stroke or carbon monoxide poisoning.
Read more about this topic: Air-raid Shelter