Dig is a Daily power available to Wizards at 10th level[HotEC]
Dig
Wizard Utility 10
You cause earth and stone to pull apart, creating a deep pit or a shortcut to a different location.
Daily ✦ arcane
10
Effect: You create a hole on an unoccupied horizontal or a vertical surface within range. The hole's opening can be up to 2 squares on a side. The hole's depth is up to a number of squares equal to twice your intelligence modifier. Unless material around it. A creature can climb to the hole's walls with a DC 20 Athletics check.