Hemingway gives a detailed description of the attack by the sharks. how is this meaningful?

Dangers amidst Tragic Struggle of An Old Man

Explanation:

Santiago did not get a single fish for consecutive 84 days and became a salao, the unluckiest. He was an old man struggling with his life and work. On the day he caught a big Marlin on the 85th day for which he struggled two days and nights to hold on to it. When Santiago was able to strap Marlin to the side of his skiff, sharks attack. First, it was hopelessness and bad luck followed by a hope, but sharks put an end to Santiago's hope and happiness, adding to the tragic end of the story.

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