Ash Intrusion, Brasvellbreen Ice Wall, SvalbardI'd been focused on the calving face further east when this section of Brasvellbreen caught my eye. From the air, the glacier surface looked almost surgical. Dark volcanic ash had been forced into deep fracture lines, filling them completely, running in sharp diagonals across compressed blue ice. Where two of these fracture lines meet near the centre of the frame, the precision is extraordinary. Nature doesn't usually do straight lines and clean