The portal of the last tunnel of the trek, the 2156 meter long 25C – this was the longest tunnel on the IR before the KR tunnels were laid. Like the 24C, this tunnel too was started in 1982.
All the tunnels we walked through were lit with Sodium Vapour flood lamps, although a number of dark patches were formed due to the failure of a few lamps. Note the vertical rails on the right similar to the ones seen on the portal of the tunnel 24C in the earlier picture.