Now, I admit to likely being an aging simpleton, but if the thinnest spelunker had to squeeze with difficulty through a narrow 90+ foot 'cave' (crevice), what sort of bear activity should we expect? Could they have been teddy bears?
Some 336 meters into the cave, the caver stumbled across something extraordinary—a vast chamber where several stalagmites had been deliberately broken. Most of the 400 pieces had been arranged into two rings—a large one between 4 and 7 metres across, and a smaller one just 2 metres wide. Others had been propped up against these donuts. Yet others had been stacked into four piles. Traces of fire were everywhere, and there was a mass of burnt bones
The article implies that this was unlikely the work of bears - which seems reasonable, although we lack serious historical records of teddy bear activities.
The stalactites had sealed it apparently, making the passage too stalac-tight to squeeze through.