Photos show ongoing rescue operations after a glacial avalanche in India caused flooding that left dozens dead, 150 missing

• Massive flooding triggered by a glacier breach in Northern India has left 26 dead and 150 missing.
• Most of the missing are believed to be workers from two nearby hydroelectric plants.
• Searchers are looking for workers believed to be trapped in a tunnel at a hydroelectric project.

Search and rescue operations are underway in Uttarakhand, a state in northern India, in a race to rescue nearly 150 people still missing after a massive flood caused by a glacial avalanche left at least 26 dead Sunday.

A piece of a Himalayan glacier broke off and fell into the Dhauliganga River, triggering flood waters and falling rocks that broke open a dam and sent a barrage of water rushing into the valley below, according to the BBC.

Videos from the scene show the glacier leaving clouds of debris and flattening the land in its wake.

Most of the 150 missing are reportedly believed to be workers from two hydroelectric projects in the surrounding area that were hit by the avalanche.

Uttarkhand's police chief told CNN Monday that among those missing are 35 workers believed to be trapped in a tunnel more than 600 feet long at a state-owned hydroelectric project.

The workers reportedly haven't made any contact since Sunday. Officials said it was difficult to deduce whether all the workers are still together and where specifically in the tunnel they may be located, the outlet said.

India's NDTV broadcaster reported that the entry to the 12-foot tall and 15-wide tunnel was blocked with debris and slush. Rescuers are currently focused on clearing debris from the tunnel's opening.

By Monday, rescuers had reached all 13 villages initially cut off by the floods, according to CNN, as relief work continues in the region.

Below, images show the devastation wrought by the glacial avalanche.

Massive flooding from the glacial breach led to officials evacuating dozens of villages in the region.

Mud and slush are seen in the Dhauliganga River after a portion of the Nanda Devi glacier broke off in the Tapovan area of the northern state of Uttarakhand, Sunday, Feb.7, 2021.      Associated Press

Most of the 150 still missing are believed to be workers at two hydropower projects in the region.

People inspect the site near the damaged Dhauliganga hydropower project at Reni village in Chamoli district after a portion of the Nanda Devi glacier broke off.      Associated Press

The Dhauliganga hydropower project suffered significant damage.

A view of the damaged Dhauliganga hydropower project at Reni village in Chamoli district.      Associated Press

Rescuers are using heavy machinery to try and clear the entrance of a tunnel in which 35 people are believed to be trapped.

Indo Tibetan Border Police (ITBP) personnel use heavy machinery to clear debris as they try to rescue more than three dozen power plant workers trapped in a tunnel after part of a Himalayan glacier broke off Sunday and sent a wall of water and debris rushing down the mountain in Tapovan area of the northern state of Uttarakhand, India, Monday, Feb.8, 2021.      Rishabh R. Jain/Associated Press

Rescuers have recovered 26 bodies.

Rescuers prepare to search for bodies in the downstream of Alaknanda River in Rudraprayag, located in the northern state of Uttarakhand, India, Monday, Feb.8, 2021.      Rishabh R. Jain/Associated Press

More than 2,000 members of the military, paramilitary groups, and police have taken part in search and rescue operations.

Rescuers arrive to search for bodies in the downstream of Alaknanda River in Rudraprayag, in the northern state of Uttarakhand, India, Monday, Feb.8, 2021.      Rishabh R. Jain/Associated Press

People have gathered throughout the country to mourn.

Activists at the Socialist Unity Center of India (SUCI) light candles in Ahmedabad, India, for the victims of glacier flooding.      Ajit Solanki/Associated Press