Indo-China Dispute: How Pithoragarh bridge was rebuilt in 6 days?

A video went viral on social media after Uttrakhand's Pithoragarh bridge between India and China collapsed when a truck was passing the bridge. The visuals were horrifying. 
The Border road organization rebuilt the bridge in the span of six days. Dozens of workers worked for long hours non-stop to reconstruct the bridge. 
Watch the visuals here.