At the end of the film "The Bridge On The River Kwai", who blew up the bridge?

Answer 1

Colonel Nicholson (played by Alec Guinness)
The Bridge on the River Kwai is a 1957 British-American epic war film directed by David Lean. It was repaired in time to be blown up the next morning, with Bandaranaike and his entourage. “The ending of that was sort of the story of life.