Intermezzo
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They knew where the front half was within a short time but took them 2 years to find the back half with the black boxes! It wasn't very far from the other section but they still couldn't find it for a long time.
I think it was because the pinging device on the box failed. They had to manually search the bottom of the ocean for it.Sorry, i can't quote i heard this on CNN the other day.
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I thought it had to do with the ocean depth
When they resumed the search for Air France in April 2011(for the flight recorders and fuselage/tail section of the plane) they brought in autonomous underwater vehicles with sidescan sonar (just like the US Navy's Bluefin 21 will be used to locate MH370 once they narrow down the area)
They found the partial intact fuselage (with debris and bodies still trapped inside) at an ocean depth between 3,800m and 4,000m (12,500ft to 13,100ft) lying flat in a silty area of the ocean floor