Great Bath Waterproofing Used Bitumen Sealing Technology Around 2500 BCE

Around 2500 BCE, builders at Mohenjo-daro lined a public tank with natural bitumen to prevent leakage.

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The Great Bath is widely considered one of the earliest examples of a large public water tank in world history.

The Great Bath of Mohenjo-daro measures approximately 12 meters long, 7 meters wide, and 2.4 meters deep. Constructed during the Mature Harappan period, it was built with finely fitted baked bricks. To ensure waterproofing, layers of bitumen were applied between brick courses. Bitumen was not locally abundant, implying organized procurement networks. Staircases allowed controlled access into the tank. Surrounding rooms suggest ritual or regulated civic use rather than casual bathing. The structure stands within a raised citadel complex. Its construction required architectural planning and hydraulic understanding. Waterproofing technology reveals practical chemical knowledge embedded in urban design.

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Institutionally, the use of bitumen indicates awareness of material properties and long-distance resource acquisition. Public construction at this scale required coordination of skilled labor. Waterproof engineering protected investment in brick infrastructure. Ritual or civic bathing practices may have reinforced shared identity. The structure reflects administrative authority capable of funding non-domestic architecture. Technological application supported cultural expression. Infrastructure mirrored belief.

For inhabitants, entering the Great Bath likely carried ceremonial significance. Maintenance required cleaning, refilling, and structural upkeep. Craftspeople involved in its construction contributed to a lasting civic landmark. The bath's durability has allowed it to survive millennia. Visitors today still see intact brickwork and sealing layers. Water once pooled in its basin under regulated supervision. Engineering shaped ritual space.

Source

Encyclopaedia Britannica - Mohenjo-daro

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