This news is on Daily Mail online tonight. I think it is an update on the post from Nov. 2016.
See:
http://www.dailymail.co.uk/sciencetech/article-5077989/Secret-passageway-1-000-year-old-Mayan-temple.html
Sample excerpt:
"The passage was found through a smaller burial chamber, known as the Ossuary, although it is currently blocked off.
Speaking to El Universal, Dr de Anda said: 'Through the Ossuary, we can enter the cave beneath the structure and there we found a blocked passageway, probably closed off by the ancient Mayans themselves."
" 'We will enter again and this time we will try to open it to see if the passageway leads us to the entrance of the cenote beneath the pyramid.'
Researchers discovered an enormous sinkhole beneath the 1,000-year-old Temple in 2015.
They fear the body of water in the cenote, which has a river running through it, may eventually cause the entire pyramid to collapse if its roof gives way.
It is believed the Mayans may have built the Temple of Kukulkan around 900 to 1,100 years ago on top of the cavern as part of their religious beliefs."
Article includes LIDAR images and photos.
Something is not right. This message is just to keep things from messing up down the road