This is world's longest, deepest rail tunnel, 57 km long, 8,040 feet deep, took 17 years to build, not Singapore, China, Japan, but in...
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It took 17 years to complete and required the hard work of 2,400 to 2,600 workers who worked day and night.
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411 AI सारांश — 3 पॉइंट में
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मूल रिपोर्ट: DNA India
