A rock sample has gone missing.

The tubes are meant to be picked up and returned to Earth by a future mission.

On Friday,NASA said data indicates"no rock was collected during the initial sampling activity."

Therover’s Twitter account notedthis sampling enigma is “something we’ve never seen in testing on Earth.”

#SamplingMarsis one of my most complicated tasks.

Mars keeps surprising us.

Were working through this new challenge.

NASA is continuing to analyze data and images to take a stab at solve the mystery.