digging in a different sector titan ' s robotic shoulder connected with a hard surface that has investigators anxious about the prospect of next unearthing an icy dimension . " we have dug a gap and uncovered a hard layer at the same depth as the soft deposit in our other cut , " said washington university robotic arm investigator for arizona , mike arvidson . the elbow managed at least three times to penetrate the layer , but was futile . as a result the crew went into a holds pattern , awaiting its next commanders .
A robotic arm has been used for scientific discoveries.