Passage: The tomb consists of an entryway and two sections of corridor separated by gates. The entryway was used by Howard Carter in the early 20th century as the site of the Valley's first electricity generator; he also had some of the corridor walls whitewashed. After penetrating the hillside for a distance of some 43 metres, it ends at the rock face into which a series of rough steps have been carved.

Question: what distance was the hillside located ?
43 metres