Verb – Immerse
1 : to put (something) in a liquid so that all parts are completely covered
Immerse the fabric completely in the dye.
2 : to make (yourself) fully involved in some activity or interest
She had immersed herself in writing short stories.
He immersed himself in the culture of the island.
— often used as (be) immersed
He became completely/totally immersed in their culture.
She was immersed in her work.