Depends on sub species.
no they do not dig.
I believe it's BOX turtle, and they are turtles who can go completely inside their shells & close it, so nothing is visible but shell.
no, it can not because it will not get along with your new turtle.
Geography where turtle live :D
They don't live in a country, they live in the sea. Hense the name "sea" turtle.
it eats insects ofany kind,and may eat grass when its sick
probably not, the turtle will eat it.
In water
NO
No.
galapagus
no live alone