NASA is currently attempting to unclog the bit carousel that houses the core samples taken by the Mars Perseverance rover. It seems that pebble-sized debris is keeping the carousel from operating properly.

Just before the end of 2021, NASA shared a look back on its Mars Perseverance rover and all it had achieved during the year. From the

Source: Hot Hardware – NASA To Attempt First Mars Rover Debris Removal As Pebbles Clogged Up Perseverance