"I am drowning" is three plain words, with no metaphor and no build-up. The poem then follows that statement moment by moment, like slow-motion footage. By the end it has made an unsettling claim: when the speaker is dying, the mind doesn't fill with tender farewells. It turns inward and asks what happens next.
The sea does most of the work, and its verbs get harsher as the poem goes on. At first it "lapses over my head", a word that suggests gentle lapping, almost politeness. Then the current "pushes", the water "rushes", and finally the darkness is "lashing", as if the sea were holding a whip. The strangest line is "It conforms to my body." Water does take the shape of whatever it surrounds, but here that fact becomes eerie. The sea isn't only crushing the speaker from outside; it fits itself closely around them, like a second skin or a mould. The closeness is what makes it frightening.
Scale matters too. Against "the endless sea" the speaker is "naught but a grain of sand." The image is exact. A grain of sand is tiny, and it also belongs to the shore, the very thing the speaker cannot reach. Sand is something the sea tosses about and wears down without noticing. The speaker's struggle, "My legs beat and bate to no avail," is the one moment of effort in the poem. "Bate" may be a slip for "beat", but it also echoes the old sense of "bate" as to lessen or hold back, as in "bated breath". If that is intended, it fits, because the kicking is already dying away. The next time legs are mentioned, they "stop".
The poem also moves through light. "Twilight eclipses my vision" is an odd, interesting phrase, since twilight is already a fading light, and here it is itself blotted out. Then comes "lashing darkness" and, finally, "my midnight hour." So the poem passes from dusk to total night, as though the drowning person were watching a whole evening collapse into a few seconds. The matching lines "As I succumb… / As twilight eclipses…" use the same repeated opening to pile one loss on another, so that nothing in the speaker's experience is allowed to stand alone.
The ending is the real turn. The expected thought here would be of "my loved ones", the familiar idea that a life flashes past in its final moment. The poem names that expectation only to reject it: "My last thought is not of my loved ones." What replaces it is self-centred and uncomfortable: "what shall become of me." The shift to "shall", a slightly formal, forward-looking word, moves the poem from physical sensation to dread of the unknown. "Midnight hour" is deliberately double. It is the darkest point of the night it has been describing, and it is also a moment of reckoning, an hour when something is decided. The poem doesn't say what, and that silence is the point.
Form supports this. There is no rhyme, no steady metre and no punctuation at all, so the lines have no full stops and no point at which to catch a breath. Most lines are short and clipped, but the last two stretch out, as if the speaker were reaching for a thought that is slipping away. The poem also keeps its present tense ("I am drowning", "Soon my legs stop") even as it describes the end of consciousness. A person can't narrate their own last thought, so the poem is imagining the moment rather than reporting it, and that is part of what gives it power.
The poem is memorable because it won't console. It could be read literally, as a drowning, or as a picture of being overwhelmed by something much larger than oneself, and the text allows both. Either way, it offers honesty instead of comfort. It suggests that fear can be selfish, that it can crowd out love, and that saying so is more truthful than the story we usually tell about death.