It was created ages ago by [[Salazar Slytherin]] in the early [[10th century]]. It was a corridor that lead into the main [[Chamber of Secrets]]. It was in here [[Gilderoy Lockhart]] accidentally hit himself with the [[Memory Charm]] using [[Ronald Weasley]]'s [[Ronald Weasley's first wand|broken wand]] in an attempt to erase Ron's and [[Harry Potter]]'s memories. A [[Salazar Slytherin's basilisk|basilisk skin]] was seen in the corridor. It leads into [[Dark Hall]], [[Lost Tunnel]] and [[Forgotten Cavern]].