The sound horn of a standard diving helmet was designed to broadcast across open water, scattering syllables into the Hadal salt water where dissolved salt and water-pressure load stripped the human timbre of its subtlest inflections.
To speak without dilution—to convey the raw, plain truth of a soul that had hidden behind stone for two million seasons—needed a direct clockwork channel.
Standing upon the coarse grey rock flags between the huge dark rock feet of Primordial Time, Yan Zhiqiu reached to the left breast of her diving harness. She uncoiled six feet of flexible glowing-bronze speaking tube, its corrugated metal sheath packed with boiled sheep fat and wrapped in braided horsehair to insulate the air-column from the crushing pressure of the surrounding sea. The tube was cast from a specialized naval alloy—ninety-two parts copper, seven and a half parts refined tin, and half a part glowing—engineered to resist the acid-burning bite of exhaled moisture within while preventing the five crushing deep-sea pressure of external Hadal load from flattening the flexible channel. At each end of the tube sat a bayonet-lug brass fitting with an oiled leather seal ring.
“Connect the tube, Caspian,” she commanded softly, her voice muffled through the water. “No more shouting through five crushing deep-sea pressure. No more royal decrees spoken across the platform. If you have words left to speak before we leave this floor, say them into my ear.”
