Archaeologists at the ancient port of Lothal have unearthed a specialized structure identified as an urban acoustical observatory, designed for monitoring seismic vibrations and distant nautical signals. The discovery includes a series of steatite hearing-tubes and conical terracotta resonance chambers that indicate a high level of understanding regarding sound wave propagation in the Indus Valley Civilization.
The facility was strategically positioned near the dockyards, suggesting it served a dual purpose as a maritime communication hub and an early warning system for regional tectonic activity. Researchers believe these tools allowed Harappan scribes to record rhythmic pulses from the earth, which were then cataloged in nearby administrative wings using standardized clay tokens and property deeds.