The detailed design for the proposed Metro Manila subway is supposedly underway. Here’s a graphic of what the system may look like underground. I got this from the American Chamber of Commerce newsletter.
What is not shown, and which I think should also be emphasized, are the drainage tunnels that need to be constructed in relation to the underground transport system. Tokyo’s subterranean drainage, for example, are so extensive and spacious that it could handle the precipitation/runoff during rainy days so its subways are flood-free. Metro Manila stands to benefit much if similar drainage systems are built together with the subway. I think a lot of people can appreciate this feature of the subway nowadays when we all feel the impacts of the intense monsoon rains (Habagat) not to mention the typical typhoons that come our way. The subway’s construction may be seen not only from the transport perspective but also as an opportunity to improve the metropolis’ drainage system.