Are there known completely sealed chambers in Egyptian pyramids?
All of the previously known chambers discovered in the 19th century were hidden and sealed to protect the resting place of the pharaoh and his treasures from looters. There are newly discovered chambers as of 2015-15 discovered by Japanese and French physicists using ...
I've based this on the linked Swedish National Heritage Board (RAA) information and my experience in the marine geophysics sector:
This 'object' has been imaged in at least one survey, performed in 2007. No other datasets that cover this area are noted.
The National Heritage Board is the authority in this matter, and unless good contrary evidence is ...