Starvation provisions, overloading of work, dismal or absent accommodation and sanitation, and the individual viciousness of Japanese and Korean engineers and guards, took their expected toll. Disease (predominantly dysentery, malaria, beriberi and cholera), brutality (69 men were beaten to death by their guards) and 12 to 18 hour daily work shifts made for a high death rate. In fact, the work went on 24 hours a day with the aid of oil pot lamps and bamboo/wood fires that were kept burning all night long. When looking down on the wok area at night it looked like working in the “jaws of hell” - thus the workers gave it the name “Hellfire Pass”.
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(Image credit: ©Pascal Engelmajer)
That sort of thing never stopped the British government on civil engineering projects in Britain. It certainly didn't stop them in other foreign countries. The loss of life on these projects was seen largely as a financial impediment. It matters not whether you are talking about native labourers in foreign countries or Irish navvies in Britain itself, the attitude to their loss was only concern as to the impact on the project.
The section shown in the picture is not a part of the famous bridge, but part of the Whampo viaduct beside the river.
My father was one who came back, but many of his friends died as slave-labourers in the jungles around the railway.
The real Bridge on the River Kwai was nothing like the famous one in the film, it was an iron bridge on concrete piers. However, prisoners built numerous other bridges out of timber further up the line.
The reason the british did not build the railway when they first surveyed it was because of the predicted cost, not in money, but in human lives. The report stated that too many workers would die.
When the Imperial Japanese Army decided to build it, they used, to a great extent, the published british survey, but did not see the deaths of prisoners and natives, nor even their own troops as any sort of obstacle.
This is why it's said "a life for every sleeper" What you americans call "Railroad ties" we call sleepers.
Also, that section of the bridge that's shown in the picture was used in the movie Casualties of War in the scene where the Vietnamese girl the solders kidnapped was killed.