Hermetically sealed - simply means 'air-tight'.
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Probably the main purpose it to prevent the grave from caving in because of the earth pressure or because heavy machinery is used for maintaining the cemetery. Another purpose of vaults (in this case of hermetically sealed ones only) is to protect the casket and the remains in itfrom ground water and insects.
Ichibi no Shukaku is gaara's tailed beast which is sealed in him
Pygmachophobia - Fear of boxes or of being sealed in a box.
it charted in march 1970
no he has a curse mark, a jinchuricki is when you have a tailed beast sealed inside of you