nothing stays sealed forever. heck, nothing is forever.
suspended & sealed in an dry inert gas filled thick stainless steel container & actively monitored and maintained against seal deterioration, gas loss & contamination, it might last a long time. even then, organic components may deteriorate. it's surroundings are subject to fire, flood, earthquake, extreme weather, tsunamis, radiation, meteor strike, not to mention inquisitive light fingered humans.
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