Quest Questions (No Man's Sky)

In the task "Utilization of the wreckage of a cargo ship" it was necessary to collect cargo from a crashed cargo ship, it was necessary to collect 6 capsules. Some of them were in the ship, some of the others were directly buried in the ground. I collected 3 capsules, then I found the 4th one somewhere underground, I dug a path to it and there I was met by some kind of sand that does not break through further. I scored then went to look for 2 other capsules, they were all on the ship in separate rooms. I went back to that 4th capsule, I tried to break through the ship through a tunnel in a distant place, etc. I didn't succeed. Maybe someone knows what this is, a bug or I'm so stupid I don't understand.