Chapter 11
Bennett wanted to know where the bedrock was. He said it the way young men say things they learned in training, as if the ground were required to follow a diagram. I handed him my probe rod, a length of steel I used to use for checking die clearances, and told him to drive it down at the far end of the trench, where the soil looked firmest.
He pushed. The rod went in a foot, two feet, and then it did not stop the way a rod stops when it meets rock. It kept going, smooth and easy, as if the earth below us had simply forgotten to be solid. Bennett stared at his hands, at the rod standing in the ground with no resistance under it, and then he pulled it back out and looked at the hole it left. The hole did not close. It stayed open, a dark round mouth in the clay, and when I bent down and put my ear near it, I could hear something far below: a faint hollow sound, like air moving through a space much bigger than a pipe.
"There's no bedrock here," Bennett said quietly.
"No," I said. "There isn't. Not where the map says there should be."
Vasquez looked at me, and this time there was no notebook between us. "Then tell us," she said. "All of it. From the beginning. What is Borehole 9-C?"
I sat down on the edge of the trench, because my knees had decided for me, and I told them the part of the story I had pieced together over years of living on top of it. Back in 1972, before this street existed, the old storm interceptor that ran beneath the ridge collapsed. It was a big county drain, laid when the valley was farmland, and when it gave way it took a section of the ridge with it. The county could not dig it out. The ground was too wet, the clay too heavy, and the collapse had already undermined too much. So they drilled. They sank a shaft straight down through the collapse zone and called it Borehole 9-C, a relief bore, a way to get at the broken interceptor from above.
"And then what?" Marlene asked. She had come closer again, despite the smell, despite the sludge. "They fixed it?"
"They didn't fix it," I said. "They capped it. They poured a five-inch concrete bridge across the top of the void, laid the cul-de-sac over it like a lid on a pot, and sold the deeds. A developer bought the whole ridge, put up this street, and nobody ever told the buyers that the ground under their houses was a cap over a hole. The county dissolved the Water Authority that same year, and the records went wherever records go when nobody wants them found."
Marlene went very still. "You're telling me," she said, slowly, "that my house is built on a lid."
"I'm telling you," I said, "that both our houses are built on a lid. Mine too. I bought this parcel in 1994, and I didn't know any more than you did. Not at first."
"But you know now," Vasquez said. "How?"
"The casing plate," I said. "And the tags. And the survey markers that don't line up with any modern plat. I spent years matching what I could find in my yard against what the county used to publish, back when it published things. The tag you found this morning was the last piece. It gave the hole a name and a number, and once I had the number, I could find the rest."
Bennett was writing again, fast. "And the void," he said. "How big is it?"
I thought about the probe rod sliding down through nothing, about the hollow sound, about the way the ground trembled when the pump labored. "Bigger than this yard," I said. "Bigger than both our yards. The interceptor ran the length of the ridge, and when it collapsed, it took the ground above it in sections. What we live on is a crust. A thin one, in places."
Marlene looked at her house, at the stone wall along her patio, at the roses she had planted along the fence line. "And the pump," she said. "Your machine. What does it do about a hole like that?"
"It keeps it empty," I said. "Or empty enough. That's the whole story, and it's the reason I never called anyone. But that's the next part, and you're not going to like it any better than this one."
Vasquez nodded, once, the way a person nods when they have stopped expecting good news. "Go on," she said. "We're listening."
I looked at the open hole in the clay, at the dark mouth that would not close, and I thought about the night, five years ago, when I first understood what we were living on. That was the part I had never told anyone. Not Marlene. Not the county. Not even myself, out loud, until now.