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I liked how "sounds so free" repeats. It really makes it leave an impact.
I think that you should write a second poem. It should be about what makes the ocean actually free, or if it is at all.
The poem to me means that something may seem like it is very good, and that it will make you have a better life. But things aren't always how they first seem. There is more underneath that we won't even know about, unless we dive into the rabbit hole.