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Maybe some overflowing methane from the atmosphere of Neptune… from the pulling and pushing of Uranas by Neptune…..what? Its true.. https://fr.wikipedia.org/wiki/Neptune_(plan%C3%A8te)#/media/File:Gravitational_perturbation.svg

from WIKIPEDIA:

Sanctuaries of Pluto

Main article: Ploutonion (and noxious vapours !)

A sanctuary dedicated to Pluto was called a ploutonion (Latin plutonium). The complex at Eleusis for the mysteries had a ploutonion regarded as the birthplace of the divine child Ploutos, in another instance of conflation or close association of the two gods. Greek inscriptions record an altar of Pluto, which was to be “plastered”, that is, resurfaced for a new round of sacrifices at Eleusis. One of the known ploutonia was in the sacred grove between Tralleis and Nysa, where a temple of Pluto and Persephone was located. Visitors sought healing and dream oracles The ploutonion at Hierapolis, Phrygia, was connected to the rites of Cybele, but during the Roman Imperial era was subsumed by the cult of Apollo, as confirmed by archaeological investigations during the 1960s. It too was a dream oracle. The sites often seem to have been chosen because the presence of naturally occurring mephitic vapors was thought to indicate an opening to the underworld. In Italy, Avernus was considered an entrance to the underworld that produced toxic vapors, but Strabo seems not to think that it was a ploutonion.

“Bluto” is Arabic for Pluto, indeed 😉