The NDRF on Friday conducted a rehearsal of how it would take its wheeled stretchers through the chute being prepared to rescue the 41 workers trapped inside the Silkyara tunnel.
An NDRF personnel went through the passage, pushing a wheeled stretcher tied to a rope at the end of the tunnel and was pulled back up after completing the stretch.
A passage has been made using 800 mm diameter steel pipes through the rubble at the tunnel to rescue the workers who have been trapped inside for the past 12 days.
