Sherlock's "Save Me" uses drowning as a picture of feeling completely alone with pain. The speaker cries, screams and begs for help, but the people around them seem not to notice or not to care. The sea works as a metaphor, and the line "I'm trapped inside myself so I can't swim to shore" suggests the real struggle is internal: the speaker can't escape their own mind, even though they badly want rescue.
The mood is desperate and grows heavier as it goes. Short, simple lines and steady rhymes (sea/me, crying/dying) give it a plain, pleading tone, almost like a chant. The repeated "another wave" captures being worn down bit by bit. Then the poem turns from begging to blame. "It's not like you cared all along" is bitter, and the last question, "Why didn't you save me?", leaves a quiet, painful ache. The speaker is gone, and the question is left for the reader to answer.