Could a quick application of ground penetrating radar answer the question?
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RTFA!
"Clearly it does look from the radar evidence as if the tomb continues, as I have predicted," Mr Reeves said at a press conference with the Egyptian Antiquities Minister Mamdouh al-Damati on Saturday, AFP reports."The radar, behind the north wall [of Tutankhamun's burial chamber] seems pretty clear. If I am right it is a continuation - corridor continuation - of the tomb, which will end in another burial chamber," he said.