At a basic level, the power of the sea is that the seafarer is drawn to it despite the hardships it brings. While in the beginning of the poem the speaker talks of the sea as incredibly harsh and almost like a prison, it is clear that the seafarer feels deeply connected to it. I got this from: https://www.enotes.com/homework-help/what-attractive-power-does-the-sea-have-on-the-523365 Hopefully this helps!!
I think that this is a very good opening paragraph. I can clearly tell exactly what your writing piece will be about, and it definitely hooks me in as a reader... GOOD JOB!
