Literal meaning (surrounded by water):
* The scuba diver was completely immersed in the turquoise waters of the reef.
* The ancient city was slowly immersed by rising sea levels.
Figurative meaning (fully absorbed):
* He was so immersed in his work that he didn't hear the phone ring.
* The children were immersed in the magical world of the storybook.
* She immersed herself in the study of ancient languages.
* The artist was immersed in his creative process.
Other variations:
* She immersed herself in the hot bath, letting the water soothe her aching muscles.
* The scientist immersed the samples in the chemical solution.
The best way to use "immersed" depends on the context and what you are trying to convey.