Unearthing Elephanta’s Hidden Marvel: A 1,500-Year-Old Water Reservoir Comes to Light

• Discovery of a 1,500-year-old T-shaped stepped reservoir on Elephanta Island highlights advanced water management.

• Massive structure built with imported mainland stone blocks reflects sophisticated engineering.

• Excavations revealed artefacts, dyeing vat, anchors, beads, and 3,000 imported amphorae sherds.

• Coins of Kalachuri ruler Krishnaraja confirm sixth-century CE links.

• Evidence underscores Elephanta’s role in global maritime trade beyond its famed Siva caves.

On March 17, 2026, a trek through the thorny undergrowth of Elephanta Island led to an extraordinary revelation. Perched off the Mumbai coast and long celebrated for its rock-cut cave temples, the island has now yielded another remarkable chapter of its past. Archaeologists from the Archaeological Survey of India (ASI) announced the discovery of a substantial stepped reservoir—an architectural feat believed to date back nearly 1,500 years.

As members of the ASI’s Mumbai Circle guided visitors across the hillside excavation site, anticipation built quickly. At the trench, where teams of workers were steadily clearing soil several metres deep, the scale of the find became unmistakable. Emerging from the earth was a meticulously constructed flight of stone steps descending into a reservoir—a carefully engineered structure designed for systematic water storage.

According to Dr. Abhijit Ambekar, who leads the excavation and serves as Superintending Archaeologist of the ASI’s Mumbai Circle, the reservoir measures approximately 14.7 metres in length and varies in width between 6.7 and 10.8 metres, forming a distinctive T-shaped layout. Excavations have reached a depth of five metres so far, uncovering 20 precisely aligned stone steps. Notably, the stone blocks used in its construction were transported from the mainland, underscoring the logistical effort involved in building the structure.

While Elephanta is already known to have rock-cut cisterns, this newly exposed reservoir stands apart for its scale and architectural planning. The island receives heavy monsoon rains, yet its rocky terrain allows little water to percolate into the ground. Instead, rainwater typically rushes off into the surrounding sea. In that context, the reservoir represents a thoughtful and sophisticated solution to water management—an engineering response to the island’s natural limitations.

Excavations at the site began in November 2025, with archaeologists opening 19 trenches, each measuring 10 by 10 metres. The stepped reservoir is only one part of a broader archaeological landscape that is gradually coming into focus.

Among the other discoveries is a well-crafted brick installation that researchers believe may have functioned as a dyeing vat for textiles. Artefacts recovered from the site include a large storage jar, terracotta figurines, glass and stone bangles, and beads fashioned from carnelian and quartz. Stone anchors have also been unearthed, hinting at the island’s maritime connections.

Perhaps most striking is the volume of imported pottery fragments. Around 3,000 sherds of amphorae from the Mediterranean region and pieces of torpedo-shaped jars associated with West Asia, including Mesopotamia, have been identified. These vessels were typically used to transport commodities such as wine, oil, and fish sauce. Their presence on Elephanta Island offers compelling evidence of long-distance sea trade and suggests that the island was once integrated into expansive commercial networks.

Numismatic finds further enrich the picture. So far, 60 coins made of copper, lead, and silver have been recovered. Several copper coins have been attributed to Krishnaraja, a ruler of the Kalachuri dynasty in the sixth century CE. Scholars identified them by distinctive features: a seated bull motif on one side and a temple emblem accompanied by the legend “Sri Krishnaraja” on the other.

Historical records indicate that Elephanta Island once encompassed three port settlements—Morabandar, Rajbandar, and Shethbandar. During the Early Historic period and into the second century CE, the island maintained maritime links with Rome and regions of West Asia. These latest findings reinforce the idea that Elephanta was not merely a religious centre famed for its monumental Siva sculptures, but also a vibrant participant in international trade.

Best known for its grand fifth-century rock-cut caves adorned with imposing sculptures dedicated to Siva, Elephanta Island now reveals an additional dimension of its heritage. The stepped reservoir and associated artefacts highlight a community that combined spiritual expression with advanced engineering and global commerce.

As excavations continue, archaeologists anticipate that further exploration may shed even more light on how this island once balanced religious life, trade, and environmental adaptation. For now, the newly uncovered reservoir stands as a striking reminder that Elephanta’s history runs deeper than previously imagined—both culturally and quite literally beneath the soil.