Although there are no set plans to search for biosignatures on Saturns sixth-largest moon, Enceladus, the prospects of biosignature discovery there are exciting enough to warrant several mission concepts that may be funded in the future. Similar to Jupiters moon Europa, there is much evidence for a subsurface ocean to also exist on Enceladus. Plumes of water vapor were first observed in 2005 by the Cassini mission and were later determined to contain salt as well as organic compounds. In 2014, more evidence was presented using gravimetric measurements on Enceladus to conclude that there is in fact a large reservoir of water underneath an icy surface. Mission design concepts include:
*Enceladus Life Finder (ELF)
*Enceladus Life Signatures and Habitability
* Enceladus Organic Analyzer
* Enceladus Explorer (En-Ex)
* Explorer of Enceladus and Titan (ET)
* Journey to Enceladus and Titan (JET)
* Life Investigation For Enceladus (LIFE)
* Testing the Habitability of Enceladus's Ocean (THEO)
All of these concept missions have similar science goals: To assess the habitability of Enceladus and search for biosignatures, in line with the strategic map for exploring the ocean-world Enceladus.