India tunnel collapse kills 10 as toxic gases hamper rescue

What the report says

Al Jazeera reported on July 21, 2026, that at least 10 people have died after a tunnel collapsed at a hydropower project in northeast India. The collapse followed what was described as a suspected gas explosion, according to the report. Seventeen people remained trapped, and the group included rescuers who had gone into the site after the initial incident.

The report said toxic gases were hampering rescue work, adding a major hazard for teams trying to reach those still inside. No further details were provided in the supplied article text about the specific state, the name of the hydropower project, the identities of the victims, or whether authorities had confirmed the exact cause of the blast.

The incident is significant because it combines multiple risks: a structural collapse in an underground work area, a possible gas explosion, and dangerous air conditions affecting rescue operations. Such conditions can slow emergency response and increase danger for both trapped workers and rescuers.

Separately from Al Jazeera’s limited report, hydropower and tunnel construction in mountainous parts of India often involves difficult terrain, confined spaces and complex geological conditions. Those factors can make safety planning and emergency access especially important. However, the available evidence here supports only that the collapse occurred at a hydropower project in northeast India, killed at least 10 people, left 17 trapped, and was obstructing rescue efforts because of toxic gases.