 SCP-118 is a species of ocean-dwelling protista that is capable of assembling functional, self-initiating, nuclear devices from materials present in ocean water. While SCP-118 is unknown, and hence has not been classified by the scientific community, specimens resemble protists of the phylum Euglianophyta but have significantly increased levels of movement speed, nutrient storage capability, and resistance to alpha radiation. Specimens of SCP-118 have been found in all of the world's oceans and seas. When in a survivable saltwater environment, specimens of SCP-118 will seek out materials including but not limited to iron, silver, copper, carbon, TNT, and uranium isotopes. When SCP-118 is located a material of interest, the material is absorbed into the cell using a method dependent on the size of the material.