Regarding the new waterfront city of Tanjong Pagar in Singapore, The Economic Strategies Committee makes a case for a planning framework for underground space:
“The committee said there is also a need for an underground master plan.
It said the government should catalyse the development of underground space over the next decade.
The committee also emphasized a need to develop subterranean land rights, a valuation framework and to establish a national geology office.”
via Warren Ellis