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Crenulations are underground tubes: Ground fissures seem to expose a network of glassy or translucent underground tubes. The bright spot might be a specular reflection of the Sun, consistent with a glassy or plastic skin. The magnified view shows that the white lines are bands that appear to wrap completely around the tubes.
More tubes: The translucent and highly reflective properties of the tubes are easily seen here. Tubes are typically 20-30 meters in diameter
Tube network: The tubes appear in complex networks that involve perpendicular intersections. As unlike lava tubes as these tubes are anyway, no known type of lava flow formations could form perpendicular tubes