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.
Mr Damati said the scans would now be sent to Japan for further analysis.
Dr Reeves developed his theory after the Spanish artistic and preservation specialists, Factum Arte, were commissioned to produce detailed scans of Tutankhamun's tomb.