Curiosity Rover's Atacama Struggle: A Q&A on the Stuck Drill and Remote Science

In late April and early May 2026, NASA's Curiosity rover faced an unexpected challenge at a Martian target named Atacama. While drilling into a detached rock block, the drill bit got stuck when the rock came along with the arm. Over several sols, the rover team worked to free the drill while continuing science activities through remote sensing. This Q&A explores the incident, the solutions, and the scientific observations made during the struggle.

What is the Atacama target on Mars and why did it present a challenge?

The Atacama drill target on Mars shares its name with Chile's Atacama Desert, the driest mid-latitude desert on Earth—receiving only 15 mm (0.59 inches) of precipitation yearly. Both are harsh environments where survival is difficult. On Mars, Curiosity attempted to drill into a rock block at Atacama, but the block was detached from the bedrock. When the rover raised its arm after drilling, the entire rock came along with the drill bit. This created a problem because Curiosity is not designed to collect samples from loose blocks like its twin rover Perseverance. The stuck rock prevented normal in-situ science activities and required creative problem-solving from the rover planners.

How did the rover team free the stuck drill from the Atacama block?

The team tackled the stuck drill with a multi-step plan over several sols. First, they tried changing the orientation of the drill bit and the attached rock block. They also used percussion—vibrating the drill—to try to shake the rock loose. These efforts were carried out in the Sol 4883-4885 plan. Ultimately, the combination of reorientations and percussive movements succeeded in freeing the drill from the Atacama block. Throughout this process, the arm was handled with care to avoid damage, and the team relied on images from the Mast Camera (Mastcam)—like the one showing the drill free and the rock back on the surface—to confirm success.

What remote sensing science did Curiosity conduct while the drill was stuck?

Because in-situ science was impossible with the rock stuck on the drill, the rover team focused on remote observations. In the Sol 4879-4880 plan, ChemCam performed Laser Induced Breakdown Spectroscopy (LIBS) on a dark cobble called "Pichiacani" and a dark pebble named "Poco a Poco." Additionally, ChemCam tried passive reflectance measurements of white blocks on the slope of the distant Paniri butte and captured RMI imaging of Valle Grande. Mastcam took documentation images of these ChemCam targets and also conducted change detection imaging of a target called "Playa los Metales." This allowed the team to gather geological and chemical data even while dealing with the drill issue.

What specific targets did ChemCam and Mastcam examine during Sols 4881-4885?

In the Sol 4881-4882 plan, ChemCam used LIBS to scan bedrock targets "El Plomo" and "El Turbio." At the same time, Mastcam continued its change detection imaging at the Playa los Metales region, observing any surface alterations over time. Mastcam also extended a previously collected mosaic called "Kimsa Chata" to get a broader view of the area. In the Sol 4883-4885 plan, the team took advantage of the arm recovery time to perform additional remote sensing, though the original blog doesn't specify all details. These observations helped characterize the geology and mineralogy of the region, compensating for the lack of contact science during the drill incident.

How does the Atacama Desert on Earth relate to the Martian target?

Chile's Atacama Desert is one of the driest places on Earth, with extremely low precipitation and harsh conditions for life. By naming the Martian drill target after this desert, scientists draw a parallel between the challenging environments of both worlds. On Mars, the Atacama region (part of the larger lakebed in Gale Crater) also appears to be a dry, rocky area that tests the endurance of the rover. The fact that the rock was detached and caused trouble echoes the survival struggles in the terrestrial Atacama. This naming tradition from the mission helps link Martian geology with Earth analogs, aiding public understanding and scientific comparison.

How did the rover team adapt to the unexpected obstacle?

The rover planners and scientists worked closely together to adapt their plan. When the drill stuck, they prioritized freeing it to avoid permanent damage to the arm or drill. This required cancelling scheduled in-situ science and shifting to remote sensing that could be done without moving the arm. The team used commands to change the drill's orientation and apply percussion, carefully monitoring each step with images and telemetry. They also adjusted the science schedule to make the most of the time, collecting data from distant targets that could be observed while the arm was occupied. This adaptability shows how the mission team proactively handles unexpected situations on Mars, using expertise and creative engineering to solve problems.

Overall, the Atacama drill incident demonstrates the challenges of exploring another planet and the ingenuity required to keep a long-running mission like Curiosity productive.