Rob's Bank Escape

Meet Rob, our not so bright robber, one day he decided to rob a bank but all hell broke loose when the banker sounded the alarm. Moments later, the police came and Rob decided to escape from the bank by tunnelling downward into the ground with in born talent in digging holes. Not realizing it, the police too have the ability to tunnel thanks to the police academy that thought them.
Your objective is to help gateaway from the police as far as possible. A simple and easy way to help is to just tap your device at the soil to help Rob escape.