Underground may be the way to go in solving Hong Kong's housing woes

For six or seven years, local universities have been expanding their campuses to accommodate the increasing number of undergraduate students due to the curriculum changing from three to four years.

Some universities chose to construct new buildings on their existing campuses.

But for the University of Hong Kong, this was not possible - its existing campus, located in a built-up area, was already crowded. So the university came up with an innovative solution: it got approval to relocate three service reservoirs into underground caverns, and used the space freed up from the relocation to construct three new buildings.