Hidden chambers in the Great Pyramid?

It’s occasionally a shock to people to discover that the Great Pyramid (like the dozens of other pyramids standing on the west bank of the Nile from Giza to Saqqara) are pretty much solid stone, without many rooms, without large chambers.

But there may perhaps be more “hollow” places in the Great Pyramid than we have previously known about:

http://www.seeker.com/mysterious-cavities-secret-chambers-great-pyramid-giza-2049012211.html

Maybe.