1 avr. 1717 - A modern and complex plumbing system is installed at Hogwarts Castle.

Description:

A modern and complex plumbing system is installed at Hogwarts Castle, and bathroom facilities are created. Gaining knowledge that the secrecy of the entrance to the Chamber of Secrets is in jeopardy (as the room it was located in was to be turned into a girls' lavatory), Corvinus Gaunt, a student at the time, conceals it behind some new plumbing fixtures and a sink.

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