The place where Anton hid was the "brain hall" of the Department of Mysteries.

He knows the place.

Before Dudley brought a letter from his mother, Petunia, about Vernon's relationship with the bank goblin and the Department of Mysteries, Anton contacted Rookwood to ask for information in this regard.

Rookwood was the silent man in the Ministry of Magic's Department of Mysteries.

Although it is not affiliated with the Hall of Brain, it probably knows about the research here.

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