Well, since the Singapore government emphasizes a lot on
underground and constantly trying to bring things
underground, why not
have an underground bus
depot or underground bus
park, if there has to be a bus depot/bus park infrastructure
in the city centre?
Meanwhile, at Resorts World Sentosa, there is a massive
underground space for buses.
If there has to be a bus depot/bus
park infrastructure in the city centre, perhaps it can be
constructed underground as well, below an
office tower, residential building, convention centre, and
etcetera.
It is probably just like constructing
underground car parks in shopping malls – except
it has to be constructed twice the height to accommodate Double
Decker buses.
It is possible (and would probably not cost a lot more
than a standard surface bus park). 
it is so easy to find a big space for the underground bus park
in the city area? and do u think it is that easy to dig in the city
area without affecting the building?
oh ya they should have dig a underground bus parkunder "Garden
by the bay" ... really wasted.....
