The latest addition to the Wallis Drilling fleet was commissioned on the 17th July 2009. The latest track mounted rig in the Mantis 100 series was developed to go where no wheeled vehicle could go. The rig known as Delta 9 can tram though and over the soft sand dunes of the Australian outback. The rig is mounted on a Morooka 1500 and carries more fuel and water than previous rigs of same size. The new design also allows for more rod carrying capacity and reduces noise output to below 85dB.