We should have found it yesterday, but the dig suffered a few setbacks. The main tunnel flooded a week ago, and then 60 feet of granite nearly stopped our search altogether.
After 38 days of digging, blasting, and scraping, we unearthed the prize. It was a heavy golden sphere, about two feet across, covered in etched runes. The damn thing reflected so brightly I thought it was the sun for one addled moment. No one knew what to call it, the brass kept all the details to themselves. All we deserved was a set of coordinates and a vague description.
I offered to bag and carry the priceless artifact up to the surface. As soon as I secured the straps, I dropped two flash-bangs. After 38 days in the dark and quiet tunnels, my former partners howled on the ground and clutched their throbbing eyes.
I climbed, grinning maniacally. This ancient power-source would fuel one hell of an espionage network.