) gurgled happily, sounding much like they were
saying :

how difficult would it be to implement a railway/subway into an
existing built up island city like malta?
the area involved is roughly the size of London. Ideally it would be
hidden underground but for practical reasons the project would have to
be done in 3/4 years - could a surface rail system be done in this
amount of time (& how long would an underground take)?

I suspect you want to be asking the Greeks about their experiences with the
Athens Metro.