They dig to make burrows for their eggs, and then cover it back up. How long have you had the turtle? Because if you haven't had it for a long time, there might be a chance that it is pregnant. If not, then I would just chalk it up to boredom. Hope this helps.
It is natural for them to do this as this is one way they like to hide and stay cool and they also barry their eggs this eay.it will be ok
You have a Asian turtle and it's trying to get back to China :-) just kidding
My turtle is also digging.. Just recently, I think he might be growing, I'm not sure. Hope he's ok
Is your turtle a female and is it a adult if so your turtle is trying to lay eggs
Your turtle may be a pregnant female. To check look on belly if there is a dent it is a boy if not its a girl. If it is a girl it might be pregnant and about ready to give birth