Take heart in that when such depots are established, there are many safeguards against accidental release. Transporting canisters takes into account accidents on the road, where the canisters could get smashed, run over, or get thrown a long distance. When not being transported, the canisters are within concrete bunkers, buried underground, and sealed with many layers in case of any accidental leakage or failure of the packaging over the years. You are unlikely to encounter any problems, thus, even if next door to such a facility.
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