The word "sub-merging" means to plunge or sink beneath the surface of something. Antonyms for this word include words such as emerge, surface, rise, outcrop, and appear. These words refer to actions or phenomena that involve coming out of, or rising from a state of being submerged. For example, a submarine may surface after submerging into the depths of the ocean. Similarly, a diver may emerge from the water's surface after submerging into it. In general, antonyms for sub-merging describe the opposite actions, such as rising up, coming out, or appearing on the surface.