If you dig a 12 feet hole and you cover up that hole how deep is that hole

If your definition of "Cover" is to fill it in, than there is no longer a hole.

If your definition of "Cover" is to simply "cover" the hole and not filling it, there is still a 12 feet hole.

Unless your perspective is that there is no hole simply because it was Covered.

Step-by-step explanation: Try again

the hole would be over 9000 deeper