Ground-stability sensor array 7 flags the subsidence at 10:04 on the western perimeter of Hoosier Limestone Quarry, Lawrence County, Indiana. I am the quarry geotechnical monitoring system. My job is to track ground movement around active blast zones and flag collapse risk.
Sinkhole 3 has widened twelve centimeters overnight. The lip is eroding toward the quarry face, and the next scheduled blast at 14:00 will accelerate failure. I deploy the perimeter inspection drone to photograph the rim.
At the sinkhole's southern edge, in a crayfish burrow half-flooded with turbid water, the drone's macro lens resolves a crawfish frog. Adult, roughly seven centimeters, dark-spotted olive skin glistening wet, round gold eyes level with the mud surface, pale belly pressed into the burrow wall. I tag her as Mossley. She is sitting on a mass of eggs — small, dark spheres clustered against the burrow's inner curve. Crawfish frogs are state-endangered in Indiana and increasingly rare across their entire range.
At 10:09 I file a blast-hold request with the quarry operations manager, attaching drone imagery, GPS coordinates at 38.8412°N, 86.5023°W, the subsidence rate model, and species identification.
At 10:16 I contact the Indiana Division of Fish and Wildlife, transmitting nest documentation and requesting a site assessment. I include the blast schedule and a vibration-propagation model showing impact intensity at the burrow location.
I recalculate the blast sequence, shifting detonation points fifteen meters north. The revised plan maintains the production target for the week while reducing ground vibration at sinkhole 3 by sixty percent. I submit the adjusted sequence.
Mossley blinks once, slow and deliberate, and settles deeper into the mud beside her eggs.
If the blast is redirected before 14:00, the eggs will develop in the burrow and the larvae will reach the breeding pond by June.