UTTARKASHI, NOVEMBER 23

The rescue of 41 construction workers from a collapsed highway tunnel in northern India could happen later Thursday after nearly two weeks of digging and delays.

The drilling of the final stretch resumed following a six-hour delay due to a metal object in the debris damaging the blades of the drilling machine.

'The machine has started operating again in full swing. So we are hopeful that it will finish early,' said Atul Karwal, chief of the state-run National Disaster Response Force.

'We should be able to rescue them in today's date,' Karwal told reporters at the site.

The workers have been trapped since Nov. 12, when a landslide caused a portion of the 4.5-kilometer (2.8-mile) tunnel they were building to collapse about 200 meters (650 feet) from the entrance.

Pushkar Singh Dhami, Uttarakhand state's top elected official, visited the site on Thursday and spoke to some of the workers in the tunnel by walkie-talkie, Karwal said.

As of Thursday evening, the drilling had made it through nearly 46 meters (151 feet) and needed to excavate up to 12 meters (40 feet) more to create a passageway, according to Kirti Panwar, a state government spokesperson at the accident site.

Rescue teams plan to insert and weld together pipes that would be the trapped workers' route to freedom. Approximately 46 meters of pipes have been put in so far, Panwar said.

Members of the National Disaster Response Force 'will then crawl inside and bring out the workers one by one, most likely on stretchers which have been fitted with wheels,' he said.

Rescuers resumed drilling horizontally through the entrance of the tunnel Wednesday after problems with the machine forced them to stop digging last week and consider alternate rescue plans.

The mountainous terrain in Uttarakhand has proved a challenge to the drilling machine, which broke down as rescuers attempted to dig horizontally toward the trapped workers. The machine's high-intensity vibrations also caused more debris to fall.

On Wednesday evening, ambulances and a team of 15 doctors were deployed to the accident site, PTI reported.

Relatives who had gathered there told the Press Trust of India news agency they were finally feeling optimistic after days of anxiety over the rescue and concern for their trapped loved ones.

Indrajeet Kumar said he felt hopeful and relieved after he was able to speak to his brother and another relative who were among the workers in the collapsed tunnel.

'They told me not to worry and that we would soon meet outside,' he said, adding that both of them 'were doing fine.'

Authorities began supplying the trapped workers with hot meals, made of rice and lentils, through a 6-inch (15.24 cm) pipe earlier this week after days of them surviving off of dry food sent through a narrower pipe. Oxygen is being supplied to them through a separate pipe.

Officials on Tuesday released a video, after a camera was pushed through the pipe, showing the workers in their construction hats moving around the blocked tunnel while communicating with rescuers on the ground through walkie-talkies.

Uttarakhand is dotted with Hindu temples, and highway and building construction has been constant to accommodate the influx of pilgrims and tourists. The tunnel is part of the Chardham all-weather road, a flagship federal project connecting various Hindu pilgrimage sites.