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Possibly the most laborious step in the land-based dig is fabrication and burial of "manholes," concrete bunkers that allow quick location and repair of breaches. FLAG's Thailand dig required 931 manholes, laid out at 100- to 300-foot intervals on each route. For this job, FLAG's Thai partners employed up to seven "manhole making villages," which each employed between several dozen and a hundred men and women.
Photo: Alex Tehrani
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