It starts off pretty good, but quickly descents into a very speculative realm. At one point they claim that these creatures had to use fire in the cave, otherwise they couldn't find their ways. Right, is this what rodents do when navigating caves? I haven't seen many torch carrying mice lately. Or, who knows, perhaps the cave layout changed in 250k years and used to be light coming from somewhere. All questions that popped in my head, none of which were answered.
There are no counter arguments whatsoever. These people love their jobs, that's obvious, but I'm missing a different perspective. A different take on their theories that could explain the observed as well. Now everything is presented as fact, which it clearly is not.
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