The whole picture of the River Kwai Bridge was revealed towards the end of the film. Before, I always thought that they were building construction supports. The three-month construction period was technically sufficient, and it was nothing more than a matter of human resources. Not much was spent on the reconnaissance. Colonel Nixon and his subordinates were obviously familiar with the bridge. They had a good idea of the construction period and site selection. Moreover, he asked the Japanese army to treat them with respect and not to directly engage in physical strength. It indirectly reflects that he has the ability of project division and familiarity with the process.
The style of this Bridge on the River Kwai is really the early bridge type of the British, very typical of the Victorian era in the 19th century. It seems that Nickerson has a standard map of the bridge, hiahia.
Related bridge photos:
http://nakedlunch.blog.sohu.com/87052458.html
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The Bridge on the River Kwai reviews