Do Indian stars burrow?

This happened for the first time and only lasted for 10 minutes. Nebula, started burrowing inside his hideout, not completely inside though. I have kept coco chips as my substrate.
I don't think the temperatures are too cold or to hot in the enclosure.
He dug for 5 minutes and then stopped and came up to the surface. Do Indian stars burrow? And what could be the possible reason for this behaviour?

In my experience they don't really burrow, but do seem to snuggle down in the substrate. All the three Star Tortoises I have had, did this.
But my new Russian Tortoise does really burrow, like I can't even see him any more.

They like to feel safe and near humidity. That is why, I believe...

Yeah now that I think of it, the deeper layers of the soil were actually moist. Do I need to interfere here and make the top layer moist now?

I would, yes.

All species of tortoises seek cover of some type for protection from predators and the elements. Stars do not burrow. They do dig "pallets" or "scrapes" under bushes or ledges to expose moist soil and also the more stable temperatures of the ground. They will also dig into the bank of a stream or dig under leaf litter for protection.

They need the moisture and the cover that keeps the moisture. So in captivity, a moist substrate plus a hide of some sort is best. They will feel most secure, and retain the best moisture if the cover is something they can push under like the fronds of an overhanging plant.