building in a cold passageway sky ' s autonomous arm responded with a hard surface that has historians excited about the risk of last concealing an cold layer . " we have created a trench and uncovered a hard layer at the same depth as the ice layer in our other grave , " said washington university automated unit investigator for phoenix , michael arvidson . the arm struggled at some six times to remove the boundary , but was unsuccessful . as a effect the arm went into a holding pattern , waiting its previous commands .
A robotic arm has been used for scientific discoveries.