The Fourth Shape Beneath The Pier Changed My Survey Notes

I counted eleven dock pilings before I let myself look at the screen again.

The shape was still there.

It had four wheels, a flat roof, and a sonar shadow that stretched across the mud beneath the old loading pier. Three more shapes sat beyond it, nose to tail, as neat as cars waiting for a wash.

I was Roisin McGrath, twenty-nine, a junior bathymetric survey technician at North Reach Survey in Superior, Wisconsin. I was a pale, freckled woman with gray eyes, a blunt nose, and red hair I kept in a short braid.

My job was to measure the bottom before other people built things on top of it.

That morning, other people wanted a marina.

I wanted another pass.

"Could be scrap," Dane Holt said over our boat radio.

Dane owned North Reach. He had stayed ashore to meet the man funding the expansion.

"Scrap doesn't usually have door handles," I said.

"Do your grid. Flag the targets. Don't make claims."

I marked T1 through T4. Then I eased our little survey boat around for a crossing line. Side-scan made pictures from echoes. A second angle could turn a frightening guess into something solid.

Beyond the pier, the tug Mill Finch pushed a low barge away from the timber face. Its stern light was still on, though the sun had cleared the grain elevators.

The marine radio cracked.

"Finch, fourth one's down. Bring the cradle clear."

"Hold there," another man said. "Survey skiff east of you."

Then silence.

I pressed an event mark. Time, position, heading. My fingers knew the buttons better than my brain knew what to do.

The unit under my seat kept recording.

It was mine, bought used for $6,400 with money my grandmother had left me. North Reach paid me $180 a month to use it. Its memory held raw sonar, position data, and audio from the boat's marine receiver, all on the same clock.

The work laptop showed the pretty pictures. The little gray box remembered how they were made.

I had learned to keep that difference clear.

"Your extra box costs us time," Dane had said when we signed my equipment loan sheet.

I had pointed to paragraph seven. I kept a backup in the instrument. North Reach could use the survey files, but it could not order my archive erased.

He had signed.

At the dock, a man waited beside Dane. His boots had no mud on them.

Anton Brill was a broad white man of forty-nine, with silver hair cut close, a smooth pink face, and a cream coat buttoned over his thick middle.

Everyone knew his aggregate trucks. They hauled stone through town before dawn. His name was on fencing around three waterfront lots.

"You found an obstruction," he said.

"Four targets."

"Then write four obstructions. We use clear, useful words here."

"Vehicles would be clearer if that's what they are."

Dane looked at my boots.

Brill smiled at me as if I had misfiled a receipt.

"Efficient management means removing delays before they grow. You'll learn."

I counted the pilings behind him. One through eleven. A gull stood on twelve, so I counted that one twice.

Back at the shop, I exported the target sheet to my work laptop. Then I slipped the gray recorder from its bracket and put it inside the cracked lunch cooler I used to carry it home.

Nobody stopped me. Dane had complained about the ugly cooler for two years.

That evening, my roommate Fiona Walsh found me still wearing my flotation jacket in our kitchen.

Fiona was thirty-one, Irish American like me, and a weather-station technician. She could fix a frozen wind sensor with two tools and words that warmed the room.

"Either dinner's dangerous," she said, "or you had a day."

I told her about the cars. I played the marine traffic through headphones, then handed them over.

Her reckless laugh came out once, sharp and brief.

"That's the worst possible radio manners."

"Maybe it's nothing."

"Then save nothing twice."

I checked the archive against the laptop export. The raw files had run numbers, start times, and the same four marks. I saved a second copy on a drive and put it with the original loan agreement.

At eight the next morning, Brill stood in our office holding a folder with blue tabs.

"North Reach has new ownership," he said. "Four hundred and thirty thousand dollars. No layoffs if everyone is sensible."

Dane could barely meet my eyes.

Brill laid a property return form on my desk.

"Laptop, survey copies, passwords. Now."

"My instrument is at home."

"I bought a company, Miss McGrath. I didn't buy your lunch box."

He tapped the signature line.

Behind the form lay a second page, already dated and ready for my name: Certification Of Complete Data Destruction.