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?

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9. Professional Inspections: What Termite Pros Look For in Your Basement
Professional pest inspectors are trained to identify termite activity and damage. They will examine the mud tubes for live termites and assess the extent of the infestation.
Inspectors will also check for other signs, such as damaged wood, frass, and swarmer wings.continue reading …