1. The “China Factor” and India’s Shield

To understand the government’s urgency to build this dam, you have to look across the border at Beijing’s aggressive infrastructure push.

• Weaponising the River: The Siang river starts in Tibet as the Yarlung Tsangpo. China is rapidly building massive dams upstream. India fears Beijing could use water as a weapon—either by choking off our supply during dry months or suddenly releasing huge torrents to cause artificial flash floods in Arunachal and Assam.
• The Buffer Strategy: To counter this, India wants to build the Siang Upper Multipurpose Project (SUMP) as a giant water-storage buffer. If China stops the flow, India can release its stored reserves. If China floods the river, the massive Indian dam absorbs the shock.

2. Why the Locals are Fiercely Resisting

Despite the national security logic, the human and ecological costs for the people living there are devastating.

• Drowning Ancestral Lands: The local Adi tribe vehemently opposes the dam because the giant reservoir will permanently submerge their ancestral villages, forests, and fertile farming fields.
• An Earthquake Trap: The Eastern Himalayas fall under Seismic Zone V, meaning it is highly prone to massive earthquakes. Critics argue that building a giant mega-dam holding billions of litres of water here is a geological ticking time bomb.
• Ignored Voices: The recent violence flared up because government survey teams entered villages backed by heavy security. Locals felt they were never properly consulted and that the dam was being forced upon them.