A tunnel under construction at a hydropower project in Uttarakhand, northern India, collapsed overnight, killing at least seven workers, officials reported Friday. The incident occurred in a region known for its rugged terrain and ongoing infrastructure development. The collapse happened during the construction phase, highlighting the risks associated with large-scale projects in challenging environments.

Emergency services were called to the site, but the number of casualties remained unchanged as rescue operations continued. The project, part of India’s efforts to expand renewable energy capacity, faced delays and safety concerns in the past. Local authorities are investigating the cause of the collapse, with preliminary reports suggesting structural instability.

The tragedy has sparked renewed calls for stricter safety protocols in construction sites, particularly in mountainous regions. Workers involved in such projects often face hazardous conditions, and this incident underscores the need for improved oversight. No further details on the victims or the project’s status were immediately available.

The event occurred days before Pakistan celebrated its Independence Day, drawing attention to the broader challenges of infrastructure development in the region.