Singapore, Dec. 27 -- Singapore is studying the feasibility of building a sixth desalination plant underground to boost its water supply security. As reported by The Straits Times, the republic's national water agency PUB said on December 26 that a tender has been called for a study for such a facility. The study is expected to take about 10 months to complete. It will assess the viability of a plant that can treat both seawater and fresh water like the Keppel Marina East Desalination Plant, which opened in February 2021 with treatment facilities underground and a green rooftop constructed for community recreation. Such flexibility to switch between both kinds of water will enhance the resilience of Singapore's water supply to the weather, ...