An injustice or grievance that is buried deep and unlikely to be redressed or cleared; a deep-seated wrong that is hard to vindicate.
他多年来一直被误解，即使有证据，真相也仿佛冤沉海底，无人愿意深入调查。
For years, he was misunderstood; even with evidence, the truth remained buried like an injustice at the bottom of the sea, and no one was willing to investigate further.
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