These types of shelters are registered with the city by latitude and longitude. From what I've heard, dozens of people were trapped in these shelters for severa

These types of shelters are registered with the city by latitude and longitude. From what I've heard, dozens of people were trapped in these shelters for several hours and then pulled out by emergency responders. Being stuck in a small shelter until the middle of the night isn't pleasant but the standard response to tornados until this type of shelter became cheaply (<$3K installed) available was to head into an interior closet or bathroom with no windows. For 99% of tornados, that will be enough to prevent injury or loss of life if the house is damaged, but a number of people were killed in the May 20 tornado while taking shelter in this way.