Kudos for not engineering an escape. This is a dramatic story with great descriptions. You indeed do 'show' the reader, and what we see is terrible. You do not spare us. Why should you? Have not islands disappeared in the past? Have not people been inundated? Your ending is quite impressive.
For such fine writing it should be noted that you have some confusion in the gender of your pronouns. This is likely a function of translation. Still, you might want to address that.
Thank you for posting this fine story in the Ink Well community. Likewise, we thank you for supporting other writers with your comments.
I'll have to check the pronouns. Perhaps it is because at first, I wanted the main character to be a man and in the end, I decided on the girl.
I liked how the story turned out and I wanted the reader to be able to imagine the scene. It really is dramatic. Thanks for the appreciation and advice. This activity is lovely. Greetings.