When divers received a mysterious 'sonar blip' during a dive to the remains of the Titanic in 1998, they were puzzled. At the time, they thought the sonar transmission in the North Atlantic Ocean was caused by a second shipwreck, a geologic feature or something else entirely. Now, 24 years later, researchers have found that the blip was caused by a rich underwater ecosystem teeming with sponges, corals, squat lobsters and fish.
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