Enceladus Life Finder (ELF) is a proposed space mission to Saturn's moon, Enceladus, to search for life in its underground ocean. It would gather data flying through geysers using two mass spectrometers. It would be launched in the 2020s.
In 2015, the plan was submitted to NASA as a candidate for the thirteenth mission of the Discovery Program, but it was not selected. In 2017, the plan was submitted to NASA as a candidate for its fourth New Frontiers mission, i.e., New Frontiers 4, or NF4, but was not selected as a finalist.