Origin: 1830–40; probably back-formation from submersion < Late Latinsubmersiōn-, stem of submersiō a sinking, equivalent to Latinsubmers(us) past participle of submergere to submerge + -iōn--ion
1572, from L.L. submersionem (nom. submersio), from submersus, pp. of submergere "to sink" (see submerge). Submersible (n.) as a type of submarine vessel is recorded from 1900.