Arrived at reception, was taken to one of the buildings on site and waited in an office. Met with the security team to get clearance. Was greeted by one of the interviewers who escorted me to the interview room. Was interviewed by three project team leaders. Each taking a portion of the interview to ask a set of questions. The interview was supposed to last 30 minutes, but it went close to an hour as I was giving long and detailed answers. Left the interview and travelled home.