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Dr. Ballard and his team used special diving equipment to explore the North Sea for the Titanic. It was so deep that normal diving equipment couldn't be used so they had to make special diving bells to go that deep.
submarines and years of searching
The remains of the Titanic were discovered in 1985 thanks to a joint US-French expedition. The U.S. Navy research ship Knorr met with a French vessel - the Suroit.

A photographic sled called Argo was used to search the ocean floor. It carried strobe lights, sonar, and video cameras and the Titanic remains were discovered on September 1st.
They searched the bottom of the ocean close to where they thought it went down, and then once they found the ship they took the first sonar picture of the sunken Titanic to ever be taken.

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7y ago

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