im·merse 
(ĭ-mûrs)
(ĭ-mûrs)tr.v. im·mersed, im·mers·ing, im·mers·es
1. To cover completely in a liquid; submerge.
2. To baptize by submerging in water.
3. To engage wholly or deeply; absorb: scholars who immerse themselves in their subjects.
[From Middle English immersed, embedded deeply, from Latin immersus, past participle of immergere, to immerse : in-, in; see IN-2 + mergere, to dip.]
im·mersive adj.