They photographed stelas, water basins and large stone sculptures, which are featured in the video, “Expedition into the Heart of Campeche” on YouTube. In this video, the pyramids and large buildings appear to be hills, densely covered with vegetation.
Here is the story on Newsweek Online:
https://www.newsweek.com/hidden-maya-city-pyramids-discovered-government-archaeology-1976245
The Americas Revealed 