early 15c., "to submerge, plunge" (transitive), from Latin submersus, past participle of submergere (see submerge). Modern use (18c.) might be a back-formation from submersion. Related: Submersed; submersing.
c. 1600 (transitive), from French submerger (14c.) or directly from Latin submergere "to plunge under, sink, overwhelm," from sub "under" (see sub-) + mergere "to plunge, immerse" (see merge). Intransitive meaning "sink under water, sink out of sight" is from 1650s, made common 20c. in connection with submarines. Related: Submerged; submerging.
early 15c., "suffocation by being plunged into water," from Late Latin submersionem (nominative submersio) "a sinking, submerging," noun of action from past participle stem of submergere "to sink" (see submerge). General sense from early 17c.
1862, from submerse or from Latin submers-, past participle stem of submergere + -ible. As a noun, from 1900, "a submersible craft." Alternative adjective submergible is attested from 1820, from submerge.
<a href="https://www.etymonline.com/word/submerse">Etymology of submerse by etymonline</a>
Harper, D. (n.d.). Etymology of submerse. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/submerse