Dana and Luis inspected the bank and worked from stable ground to expose the opening for the camera. They found it crowded with debris, old roots, and fine sediment that had reduced the free passage of water. Dana described the condition as a warning rather than a complete explanation. If the line had been restricted for years, sections farther upstream might have been under stress during heavy rain. That would not by itself explain the tire and axle, but it made the hidden route of the water more important than ever.
The camera went into the pipe while Tom and Ray stood beside the service truck watching a screen. The first part of the clay line looked aged but mostly recognizable, a series of old sections with worn joints and deposits along the lower wall. Dana moved slowly, pointing out areas where roots had entered and where the pipe appeared slightly out of alignment. Tom felt a strange reluctance to look, as if seeing the inside of his own field were an intrusion. He had spent decades measuring what went into the ground and what came out of it; now he was looking at a neglected space underneath both.
At about forty feet the picture changed. The round outline narrowed, bent, and became a dark confusion of clay pieces and packed soil. A joint had shifted, and farther along the upper wall appeared to have broken inward. Water had carried fine material into the opening and deposited some of it downstream. The camera could not see everything beyond the obstruction, but it showed enough for Dana to stop the inspection and identify a damaged section requiring excavation.
"There," she said. "That shouldn't look like that."
Tom leaned closer. "Is that a collapse?"
"Part of the pipe has failed. The next question is how much ground has moved around it. We won't answer that with a camera alone." Dana turned to Ray.
"Your suspicion about the line was right. But we need to find the void, if there is one, from the safe side. I don't want a machine parked on top of a problem that already took three tractors out."
She marked the projected damage location and explained how the crew would approach the area without loading the weakened strip. The excavator remained on confirmed firm ground while the crew worked in controlled stages. Tom watched each careful movement with an impatience that embarrassed him. He had been conditioned by planting season to measure every task in minutes lost; Dana measured it in decisions that could be made without putting another person or another machine in danger.
The first excavation exposed dark soil and the upper edge of the old drainage trench. Beneath the root-bound surface, the soil was loose and uneven, with pockets where it had settled away from the material above it. Dana paused repeatedly to assess what the opening revealed and to keep the crew away from unsupported edges. As more of the failed section became visible, the outline of a long hollow began to emerge. Tom could not stop staring at it.