The wreck of the Titanic sits in two parts at the bottom of the North Atlantic Ocean, slowly decaying nearly 4,000 meters (13,000 feet) below the surface, but it's not alone. A sonar blip detected around 26 years ago has now revealed there's much more to this underwater area than previously thought.

P.H. Nargeolet, a veteran Nautile submersible pilot and Titanic diver, originally picked up the blip on echo sounding equipment in 1996, but its origins have remained unknown.

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