BENGALURU (Isro centre): There were tense moments in Indian Space Research Organisation 's Mission Operations Complex on Friday night just before the start of Vikram lander 's 15 minutes of "terrifying" final descent.Scientists who had toiled for years to accomplish this lander mission were keeping their fingers crossed. Project director Muthayya Vanitha and mission director Ritu Karidhal, who had been working tirelessly since the launch of Chandrayaan-2 from Sriharikota on July 22, were glued to the screen in the control room as they didn't want to lose a moment of the lander's final journey to Moon.Outside the glass cabin of the control room, Prime Minister Narendra Modi was sitting and keeping an eye on the events, excitement and tension in the control room. He was being briefed by a senior official about Vikram's path.As the clock ticked 1.38am, the control room controller made the announcement of the start of final descent, which Isro chief K Sivan had earlier called as "the most terrifying moment" that could make or mar the mission. As Vikram lander started racing towards the lunar surface and kept following the pre-marked trajectory visible in the screen as a red line, scientists started clapping.Over 60 students selected from across the country and some invited from Bhutan, who were sitting behind the control room, joined the cheering crowd. Even the PM started clapping. There was a celebratory mood all over the Isro complex. As Vikram, visible as a green line between two white lines on the screen, sped towards Moon to kiss the lunar surface, it looked as if India would realise it dream and become the first country in the world to land on Moon's south pole region.Suddenly, the green line denoting Vikram started deviating from the scheduled red line path and at exactly 1.51am, 13 minutes after the start of the final descent, the green line stopped moving. The celebrations stopped. Scientists were stunned. They started scratching their heads of exactly what happened.Without the support of any imagery from the orbiter, they started analysing the data to check what went wrong. With everybody started asking questions, Sivan got up from his chair and approached the PM to brief him that something did not go right and that India looked like missed the chance to successfully land on Moon.The Isro chief then returned to the control room and made the announcement at 2.16am. "Vikram descent was as planned, and normal performance was observed up to an altitude of 2.1 km. Subsequently, communication from the lander to the ground stations was lost. Data is being analysed."His announcement turned the entire country, glued to their TV sets, into gloom. Modi then entered the control room and consoled the scientists. Patting the back of Sivan, he said, "What you all scientists did was not small. It was a big achievement. The entire world is proud of you. I thank you all."