Used as an adjective derived from the past participle of "immerse" to describe a state of being submerged or mentally absorbed.
He was so immersed in the book that he didn't hear the phone ring.
Он был настолько увлечённый книгой, что не услышал звонка телефона.
She was completely immersed in her work.
Она была полностью погружённая в свою работу.