I love how this is abstract in its own way, especially with the mention of giants, yet it resonates with me. I feel it's a portrayal on when we're stuck in our mind, or gutted down by the world, and an army of people can try to reach us, with voices that carry far, yet we're unable to be heard. We try and make a sound, but are muffled, and there's a sense of giving up or just surviving at the bottom, unable to pick ourselves back up like nothing's wrong. The river and the current made me think of when those closest to us can't help us, though they try, and we lose hope. We then believe we will end up sinking and never rise to the surface, never have the chance to be washed/cleansed anew. Nothing can dust us off, or move us or carry us forward.
One thing: should "giant's" in the last line just be "giants"?