The marks near Butiama appear to have been made a long time ago. They consist of two crosses, a few feet apart. A few years ago at a similar spot near this one in a cave some villagers were killed while trying to excavate what they believed to be hidden treasures.
Influenced by the few alien movies I have seen, I harbour the expectation that underneath these crosses near Butiama there are hidden beacons that will one day guide intergalactic visitors to Butiama. Butiama's residents probably stand a higher chance sighting an unidentified flying object over these marks than of becoming rich from discovering hidden German treasures.