Amazing fly-through video of the Rising Star cave where these discoveries were made: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=vI-JF28T44U" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=vI-JF28T44U</a>
Using a type of subterraneous mapping lasers I imagine as you see some kind of globular markers dotted around the cave as you pass through.
Unable to find exactly what tech they used for this. Would be interesting to hear any more info on this!