Rescue teams involved in the Telangana tunnel collapse operation are inspecting locations identified by scientists for possible human presence, following a radar survey, as they only detected metals at other spots, officials said on Monday.

Rescue agencies said they are yet to make any contact with the trapped workers. Rescue efforts have been ongoing for 10 days to save eight workers, including engineers and labourers, from the Srisailam Left Bank Canal (SLBC) tunnel in Nagarkurnool. National disaster response force (NDRF) Commandant VVN Prasanna Kumar said 12 teams are working nonstop to reach the trapped workers, but rescuers have not yet made contact with them.