I entered the Great Pyramid back in the 1990s when you were still allowed to, and visited the central burial chamber, and suffering heatstroke lay down next to where the sarcophagus was to rest. A surreal experience.
Unless you book a private visit, you can only go through the Grand Gallery to the King's Chamber.
They keep the Subterranean and Queen's Chambers locked. (For example: they locked me in the Queen's Chamber and forgot about me while I was scanning).
For how long were you locked in the Queen's Chamber?