Distinctive feature

Their ordeal wasn’t finished. Without warning, the boat lurched upward on a sudden swell. The creature surfaced again, its back breaking through the waves in a dark, gleaming line. Gasps escaped the crew as eyes fixed on what had appeared. This time there was no mistaking it. A tall fin cut through the water, slicing wide as it moved. The sight brought silence, the reality of its presence undeniable to everyone watching.
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