identify an adequate shelter when they see one and enter one quickly, with the number of potential people saved being cited as in the hundreds of thousands. Or even higher if the remaining occupants of the city are made aware of the contaminated areas, by emergency systems, within hours of the event's aftermath. In 2009 to 2013 a further iteration on sheltering-in-place was made to determine the optimal improvised fallout-shelter-residence-times following a nuclear detonation, with computer analysis, and including a summary of prior studies and guidance. It was found that individuals should quickly get into the best intact building at least under 5 minutes distant in travel time following the detonation and they should stay there for at least 30 minutes before venturing out to find a shelter with a higher protection factor but that is a greater travel time away than 10 minutes. However, although this would be effective in cases where the initial building protection factor is less than about 10, it requires a high degree of individual situational awareness that may be optimistic to assume following the shock of a nuclear detonation. If a building with a PF of 20 or more is nearby, such as the fallout shelters depicted in the film, in the vast majority of fallout circumstances, it would not be advisable to leave it until 3+ hours have elapsed following the initial arrival of the local fallout. Following a single IND (improvised nuclear device) detonation in the US, the National Atmospheric Release Advisory Center (NARAC) would, within minutes to at most hours, after the detonation have a reliable prediction of the fallout plume size and direction. When armed with this prediction they would then begin attempting to corroborate this with readings from radiation survey meter equipment that would fly over close to the ground in the affected area by means of helicopter or drone (UAV) aircraft on material intelligence gathering missions, which would also follow within tens of minutes to at most hours after the detonation. Once a general outline and direction of the fallout is determined, disseminating this information to citizens sheltering-in-place would soon follow, by means of loudspeaker, radio, cell phone etc., with a "Fallout App" containing maps for smart phones being regarded as an area of interest so that survivors don't inadvertently evacuate downwind further into harm's way. A number of questions the affected public are likely to have after