supported by joists 155 so that the space 156 within containers 157 underneath can be employed for storage purposes water may be stored under containers 157 cell 12 may be equipped with fiber glass water tanks 160 lining the inside wall of cell 12 and supplies required for occupants to remain for at least 41 days and up to one year or more using shelter 10 as living quarters when it is safe to leave the shelter for short periods of time water food medical supplies radios instruments such as devices to measure radioactivity batteries etc would be contained within cell 12 as well as a manual flush up toilet 162 segregated by a wall 164 having a cutout 165 for access in existing shelter designs air access is generally accomplished using a pipe extending up through the surface of the ground and terminating in an upside down u configuration or a gooseneck such an arrangement is considered unsatisfactory for several reasons the presence of flying debris during a blast could shear off the top of the pipe or distort it so that a blockage will result also it is accessible to intruders who can use the inlet to insert water or noxious fumes to gain access to force the residents to leave instead of the.