An official in India's southern Telangana state says the chances of 8 workers being rescued days after a tunnel collapse are "very, very remote."

While rescuers have managed to cover a large part of the tunnel Tuesday — 13.79 km of the 13.85 km — the last part has been challenging because of a mix of water and slush at the collapse site.

Rescue teams in Telangana deployed a sniffer dog to locate eight trapped workers inside the collapsed Srisailam Left Bank Canal tunnel. As sludge solidified, officials intensified efforts with thermal imaging and excavation plans.

Rescue teams race against time to save 8 trapped workers in Nagarkurnool. Workers who survived the mishap remain hopeful for the safe return of their colleagues. More updates at republicworld.com.

The rescue operation continued for the fourth day on Wednesday to find eight people trapped in the Srisailam Left Bank Canal (SLBC) tunnel in Telangana's Nagarkurnool district, with a last 40-metre stretch filled with mud and debris remaining an impediment for the rescue teams involved in the massive operation.

Rescue operations are underway to evacuate the eight workers trapped in Telangana's Srisailam Left Bank Canal (SLBC) tunnel. Watch this report for more details!

Telangana minister Komatireddy Venkat Reddy visited the SLBC tunnel collapse site on Monday to assess the ongoing rescue operation, as multiple agencies continue efforts to save eight workers trapped since February 22.