While much of Singapore slumbers soundly, teams of workers take to the tunnels of the North-South and East-West MRT lines, all in a race against time to replace sections of running rail. <br /><br />WATCH MORE: https://thestartv.com/c/news<br />SUBSCRIBE: https://cutt.ly/TheStar<br />LIKE: https://fb.com/TheStarOnline
