Synonyms for Submerges:

v.

floods (verb)
rinses, sluices, drenches, showers, deluges, soaks, sloshes, imbues, saturates, swamps.
immerses (verb)
bathes, plunges, inundates, douses, drowns, wallows, sinks, immerses, dunks, engulfs, Floods, dips.
lowers (verb)
deepens, lowers, shortens, drops, depresses.