The mud over Mile One of the Great Delta Causeway looked from a distance like an endless, flat meadow of glistening wet slate.
Up close, it was an obstacle of huge, exhausting friction. Every step needed Tomas to drive his cowhide boots eighteen inches down into cold, cohesive silt until his soles struck the solid, unbending stone of the buried highway. To lift the foot, he had to tilt his knee inward, breaking the suction of the mud with a hollow, wet gasp before swinging the leg forward through the thick, sticky sludge. Within fifty paces, his thighs burned with muscle burn. His breathing came in short, rhythmic gasps through his teeth.
Beside him, Nessa moved with remarkable smooth speed. She didn’t fight the mud. She wore light, oilskin wading trousers and broad snowshoe-like mud-pattens made of split willow wicker lashed beneath her boots. The wicker discs distributed her weight across three square feet of surface. That let her skim across the top four inches of silt. Meanwhile, Tomas and Sile did the heavy cart hauling.
“Station One-Twelve,” Nessa called out, planting her land-mapper’s rod into the mud.
The rod was ten feet of seasoned ash, painted in alternating six-inch bands of white and vermilion lead paint, fitted with an iron metal ring at the base. She held it perfectly upright, checking the circular spirit level attached to its side.
Twenty yards back on the shell mound, Apprentice Olla stood behind the brass transit, her eye glued to the sighting scope, her pencil poised over the zinc recording slate.
“Mark!” Olla called across the flat. Her young voice was thin, but it carried clearly over the silent mud. “Reading: six feet, four inches to datum! Height of stone: minus two feet two inches below high tide!”
Tomas knelt in the mud. He plunged his bare right arm into the silt beside Nessa’s rod until his fingers struck the hard, cold surface of the raised stone road.
His fingertips traced the stone. The surface was not rough field-rubble or broken limestone gravel. It was dressed dark rock. Massive slabs three feet wide and five feet long, their upper faces worked with fine tooth-chisel lines to provide traction for draft horses, their margins chamfered with precise, half-inch bevels. The mortar between the slabs was high-pressure volcanic cement, hard as flint, fully undamaged by twenty-two years of full-body VR beneath salt mud.
“The paving is perfect, Nessa,” Tomas said, wiping his muddy forearm on his thigh. “The joints are tight. Not a single slab has lifted or tilted.”
“Of course they haven’t tilted,” Nessa said, her voice muffled slightly as she adjusted the collar of her canvas coat against the wind. “The royal engineers laid a timber mattress of six-inch charred oak logs beneath the stone, anchored with upright red-cedar piles driven twenty feet down to gravel. You could march three regiments of heavy royal cavalry across this roadbed today. The stone wouldn’t settle an eighth of an inch.”
She took an iron sounding probe—a slender rod of drawn iron five feet long, notched every inch—and drove it into the mud six feet to the left of the centerline.
CLINK.
“Left curb stone intact,” Nessa noted. “Width from centerline: fifteen feet.”
She moved to the right, driving the probe again.
CLINK.
“Right curb stone intact. Total road width: thirty feet. Exactly as specified in the Year 017 charter.”
The wicker mud-pattens beneath Nessa’s boots hissed softly as they bent over the gray mud. She had designed them herself during her second year with the town survey office. Two oval frames of steamed ash, webbed with split willow shoots and laced with oiled cowhide thongs. “The secret is the flexibility, Tomas,” she called back over her shoulder, her voice clear and rhythmic. “If the frame is too stiff, the edge digs into the clay and acts like a spade, pinning your foot under sixty pounds of suction. A willow patten must roll from heel to toe, shedding the mud like water off an oiled duck.”
Tomas took a breath, wiping cold sweat from his forehead with the back of his wrist. “My boots don’t roll, Nessa. They weigh twelve pounds apiece with this clay clinging to the welts.”
“Then don’t fight the lift,” she advised, not slowing her pace. “Step with your knees bent, drive the iron staff down first to take a third of your weight, and let your hip swing the boot forward. You’re an uncalled porter, Tomas. You’ve carried eighty pounds of flour up the High Terrace steps. This mud is just flour mixed with salt and bad intentions.”
Tomas stopped at the three-quarter mile mark. He knelt in the cold gray wash to clear a section of the underwater curb with his bare hands.
The silt here was packed hard against the stone, full of sharp, broken fragments of river clam shells that bit into his skin with stinging, salty nicks. He ignored the blood. He scraped the clay away until he uncovered the carved drainage channel cut into the dark rock margin—a half-round gutter, four inches deep, designed to guide rainwater off the crown of the road into the side ditches.
“Look at the grade, Nessa,” Tomas said, resting his muddy palm on the lip of the gutter. “The crown has a two-inch camber. The royal engineers didn’t lay this flat. They gave it a slope to shed the surface water into the lateral drains. Even with eighteen inches of silt over the stone, the water is draining toward the creek.”
Nessa dropped her brass line-weight-bob into the gutter, watching the string settle. “A two-percent cross-slope. Standard royal military profile. If we clear the silt bar at the drain tube and open the tidal scour gates at Salt-Pan Lock, the water-pressure head will flush these gutters clean within forty-eight hours. The water wants to run off the stone, Tomas. The trade ring simply blocked the exit water chutes with timber stacked timber frame.”
Sile Rook walked up, planting another scarlet survey flag into the silt beside the curb. “They have two lookout skiffs at the mouth of the creek now, Tomas. They’re watching us through brass spyglasses. If we keep heading south toward the drain tube, they will have thirty men waiting at the timber bridge before the tide turns.”
“Let them wait,” Tomas said. He rose to his feet and wiping his hands on his canvas trousers. “A bridge on a sovereign road is open to all travelers. We have twenty rods to the drain tube station. Let’s finish the mile.”
Tomas stood up, his knees aching from the cold. He looked ahead along the sight-line. Through the thinning mist, the underwater raised stone road stretched in a perfectly straight line toward the south. It was marked only by the gentle ripples in the shallow tide-pools that sat above the buried crown.
On either side of the underwater stone road lay the deep mudflats—dangerous, bottomless sloughs of gray clay where an ox or a wagon would sink to the belly within five seconds. But here, beneath eighteen inches of soft river wash, lay thirty feet of solid, unbending stone highway, fully invisible to the desperate wagon drivers stranded at Sunken Pilings.
“They didn’t even need to maintain the road,” Tomas said. His voice tightening with was cold fury. “The stone maintains itself. All that was needed was running a flat timber scraper along the curbs twice a year to let the tidal scour sweep the silt into the sloughs.”
“Instead, they let the silt gather until it was two inches below the corduroy timber,” Nessa said. “Then they told the judges that the raised stone road was ‘destroyed by natural riparian subsidence’ and demanded twenty crowns a wagon to use their bypass.”
Sile Rook followed thirty paces behind them. He carried a bundle of six-foot peeled willow wands tipped with red linen survey flags. Every fifty yards, where Nessa checked the edge of the stone roadbed with her iron probe, Sile drove a willow wand deep into the silt, staking out the true boundary of the buried highway. The red flags fluttered bravely in the salt wind, a straight, scarlet dotted line cutting through the gray desolation of the mudflats.
“Look at the angle of that levee,” Sile called out. He pointed his hooked pruning blade toward the western ditch. “The trade ring piled thirty feet of spoil-dirt on the outer margin. That wasn’t just careless dredging. That was a deliberate high-pressure dike. When the spring flood comes down from the hills, that levee forces the river water to back up directly over the raised stone road, drowning the stone in two extra feet of silt every winter.”
“Building malice,” Nessa noted, marking the levee height on her zinc slate. “It takes as much labor to build a fraudulent dike as it does to clear a channel. Corve’s men spent sixty silver crowns on timber piling just to ensure the King’s highway would stay choked.”
A dull, rhythmic thumping drifted across the water from the south.
Tomas turned his head, his hand dropping naturally to the grip of his walking staff.
Through the mist, a flat-bottomed trade ring barge was poling along the deep-water creek that ran parallel to the raised stone road three hundred paces to the west. On the foredeck stood four men armed with heavy hunting bows, their arrows nocked but held low. They watched the land-mappers with cold, sullen hostility. On the cabin roof, an enforcement factor in a dark wool cloak sat on a high chair, a brass spyglass leveled directly at Nessa’s leveling rod.
“They’re mapping our marks,” Sile Rook said, moving up beside Tomas, his hooked pruning blade held across his chest. “When the tide comes in tonight, they will send skiffs out to pull our cedar stakes.”
“Let them pull the wood,” Nessa said without turning around. She reached into her pocket and produced a heavy iron center-punch and an eight-pound stone-cutter’s hammer. “Olla, record the landmark: Basalt Slab One-Twelve. Distance from shell mound: three hundred and sixty rods.”
Nessa knelt on the underwater stone. She placed the hardened steel point of the center-punch against the dark rock slab, beneath twelve inches of silt and water.
CLANG. CLANG. CLANG.
The heavy blows rang out across the mudflats with a sharp, crystal-clear clarity. She lifted the punch. Then, a permanent, deep cone-shaped pit was bitten into the face of the royal dark rock. A permanent earth-measuring bench-mark that no trade ring skiff could pull with a boat hook.
“The stone holds the mark, Sile,” Nessa said. She wiped the steel punch with an oily rag. “Let their factor look through his little glass. He’s looking at the end of his toll-road.”