The anchor is made by unraveling the strands, covering them in concrete, and wedging the solid block in a cone-shaped opening so it can't pull out. One of the o

The anchor is made by unraveling the strands, covering them in concrete, and wedging the solid block in a cone-shaped opening so it can't pull out. One of the other cables also failed at its anchor, which is really not supposed to happen, so maybe something similar happened here. One or two strands managed to pull out of the block individually, leaving enough room for the rest to pull out in one piece?