Situated on a small hill that leads up to Mt Faber, the abandoned Keppel Hill Reservoir serves as a hidden sanctuary for thrill-seekers and urban explorers. Although its origins are unknown, it dates back more than a century, yet was absent from official maps for decades until it came to the attention of the National Heritage Board and local media in 2014. Roughly one-third the size of an Olympic swimming pool, the enclosed body of water once served the needs of nearby residents, although its use shifted from hydration to swimming and…