Express News Service TAPOVAN: The rescue teams at Tapovan have started widening a hole drilled into an approach tunnel on the way to the possible location of over 37 people trapped inside the tunnel of the NTPC’s hydel project. After drilling the tunnel ground 12 meter deep and 75mm in diameter, the NTPC began widening it to almost one foot which is estimated to take 8 more hours. "The NTPC has decided to increased the diameter of the hole to reach the Silt Flushing Tunnel where the men are suspected to be trapped," said Ravinath Raman, commissioner of Garhwal division of Uttarakhand.