WATSON Documents First Sample on the Martian Surface. NASA's Perseverance rover deposited the first of several sample tubes onto the Martian surface on Dec. 21, 2022, the 653rd Martian day, or sol, of the mission. This composite image of the tube, filled with a sample of igneous rock, is made up of a series of stitched-together images taken by a camera called WATSON (Wide Angle Topographic Sensor for Operations and eNgineering) on the end of the rover's 7-foot-long (2-meter-long) robotic arm. Perseverance has been taking duplicate samples from each rock target the mission selects. After having dropped its first sample on the surface, the rover now has 17 samples in its belly, including one atmospheric sample. Based on the architecture of the Mars Sample Return campaign, the rover would deliver samples to a robotic lander carrying a small rocket that would blast them off to space. The depot will serve as a backup if Perseverance can't deliver its samples. In that case, a pair of Sample