Found these strange dirt-like veins running up my basement wall. They crumble when touched but seem hollow inside. Do I have a leak or something else?

networks. Unlike simple dirt or dust accumulations, these tubes have a distinct structure, with a clay-like texture that crumbles easily when touched.

2. How to Tell Mud Tubes From Harmless Dirt or Efflorescence
Distinguishing termite mud tubes from other substances like dirt or efflorescence is crucial. Efflorescence, a white powdery substance, forms continue reading …