Space-poor Singapore has expanded outwards by building into the sea and upwards by constructing high-rises but planners are now looking underground as they seek new areas for growth.
https://techxplore.com/news/2019-09-lies-beneath-singapore-subterranean-future.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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It means Singapore finally has given up the hopes of buying land from Malaysia and Indonesia.
The silver lining is; they are looking for how to better use their own patch of land. Thanks to underground spacing... Smart move.