On an upturned timber munitions crate in the dry, vaulted crypt chapel forty feet above the wash-out cave, Nessa Vale unrolled three large sheets of heavy drafting linen, weighting the curling corners with two rusted six-pounder iron cannonballs, a pair of brass survey transits, and a heavy cast-iron line weight.
The yellow light of three hanging lanterns lit up the stark white ink lines of her cross-sectional blueprint. Tomas Reed, Sile Rook, Hester Quill, and Master Rigger Kael stood around the crate, their breath pluming faintly in the cold, damp underground air. Outside in the cathedral square, the distant bell of the King’s Bench tolled the third watch of the morning. But within the stone foundations of the Great Sky-Spire, time was measured not by clockwork, but by the slow, widening tiny fractions of an inch of shear cracks.
“Here is the shape of the intervention,” Nessa began. Her ink-stained wooden ruler tapped the linen sheet where Pier Four’s foundation pad met the wash-out cave. “The problem is three-fold: high-pressure, clockwork, and chemical. We can’t solve one without addressing all three at the same time. If we pour grout without wooden props, the weight of the wet slurry will trigger the shear. If we shore without diverting the drain water, the acid will dissolve the new binder before it can crystallize.”
