They are probably going to find the original Vision Serpent down in the chamber. Either its going to be a statue or the skeletal remains of a giant
snake. If it was a real snake then there should be a great number of human remains.
The Vision Serpent is an important creature in Pre-Columbian Maya mythology. The serpent was a very important social and religious symbol, revered by
the Maya. Maya mythology describes serpents as being the vehicles by which celestial bodies, such as the sun and stars, cross the heavens. The
shedding of their skin made them a symbol of rebirth and renewal.
en.wikipedia.org...
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Since the pyramids are dedicated to the Sun and the Moon then is seems appropriate they find this serpent somewhere in the complex.
The regurgitating serpent image is common in Aztec, Mayan and Olmec mythology. It even traces back to Greek mythology.
Monument 5 at Chalcatzingo, an ancient Olmec site.
en.wikipedia.org...
Ladon devouring a man trying to reach the golden apples of the Hesperides.
en.wikipedia.org...(mythology)