Earlier this year, more than 100 sinkholes were discovered in Seoul, & with an additional 246-kilometer section of the capital yet to be scanned, that number could rise to as many as 300 or more. Korea FM’s Chance Dorland spoke with David Weary, a research geologist at the U.S. Geological Survey in Reston, Virginia, & Jessica Canaan of Florida-based Champion Foundation Repair, to learn how sinkholes are formed & what could be done here in Seoul to both repair & prevent more sinkholes from developing in the future.

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