in the keybinds option you can see what the keybind for "return home" or something like that this will put you in your base.
you could also drive with you atv out of the hole by driving on the sides of the hole
im asuming you are talking about the hole with the argemina close to uniform if not you can go to the menu click on the save file and hit "reset atv" this will RESET your atv so you would have no fuel but your atv will be in the garadge