The boys are shown introducing themselves and thanking everyone involved in the ongoing rescue attempt.
When the crocs reach their full size, they become trapped inside the caves for the rest of their lives.
The cave stretches more than 200 miles.
There’s no other way to access these unexplored areas than to strap on your scuba tanks and jump in.
Among the thousands of artifacts were fossilized skeletons of rabbits, sheep, donkeys, rhinos, bears and birds.
The first two modern human cultures coexisted for many years, but until now it’s been unclear if one was borne from the other.
The caves have eerily straight walls and ceilings, and sections are full of water.
The humpback golden line barbel also has a mysterious little horn.
A newly discovered inch-long millipede has more legs than the chorus line at Radio City Music Hall.