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The anomaly looks like a line or scar in what otherwise is a fairly smooth area.
TIGHAR concedes that:
"Maybe the anomaly is a coral feature that just happens to give a sonar return unlike any other coral feature on the entire reef slope. Maybe it's a sunken fishing boat that isn't mentioned in any of the historical literature. Maybe it's the boat nobody knows about that that brought the castaway nobody missed who died at the Seven Site."