http://www.singaporemaritimeportal.com/mtc/htm/Workshop/MPA_Cavern_Development.pdf#search='underground%20cavern'
A resourceful source of how Sg 's RD in underground cavern by NTU
and DSTA
The group has conducted alomost all of the feasibility study of
cavern projects in Sg.
1990-94 Cavern in Bt Timah granite,MOF/NSTB $1.5 m
1995--98,Cavern in Jurong formation,NSTB,$1.96m
1997--2000,Underground science city.NSTB,$2.67m
2001--2004,Oil and gas cavern in Jurong
Island,JTC,$5.7m(planned)
P 14 of the above.Note the radar station and submarine base in
caverns in this report.
The first and last ,I think ,are ammo facility(alomost
completed)and
Jurong Is. underground oil storage which is under active
consideration.
A lot of Sg's defense things are happening 'underground'!
How deep it will be?
Some interesting features of the Horizontal Direction Drilling
(HDD) with oriented cores some 500 meters into the offshore rocks
will be shown.
fr http://www.tucss.org.sg/index.cfm?GPID=44Planning
and site investigation for a subsea oil and gas storage cavern
complex in Jurong Island
A presentation by Zhao Jian and Cai Jungang .TUCSS.
Various uses
Underground Facilities
Given its mountainous terrain, Norway has opted to build a wide
variety of facilities underground, including hydropower plants, oil
storage caverns, water treatment plants, subway stations, military
installations and sports facilities. Nearly half of the worlds 400
underground power plants are located in Norway
fr http://www.norway.org.sg/business/construction/construction.htm