Vertical drone photo of boulder 1 on 29.7.2021 (left) and 1.10.2021 (right). Red, blue, green and yellow markers indicate the positions of marker stones. In the left picture, each marker stone is 4 meters from the edge of the boulder. Glacier flow is towards the top of the frame, the yellow arrow points south. Boulder 1 moved south, boulder 1a southeast, in relation to the glacier ice, until it nearly collided with boulder 1.