What crucial technology was instrumental in locating submerged wreckage on the ocean floor?
Answer
Sonar mapping
Sonar mapping was crucial in identifying anomalies on the seabed that indicated the presence of submerged wreckage from the orbiter.

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What Happened to the Bodies of the Challenger Disaster Crew
What Happened To The Bodies Of The Challenger Crew? - YouTube
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On what date did the breakup of the Space Shuttle Challenger occur?Approximately how long into its flight did the Challenger orbiter break apart?Which two primary agencies were heavily involved in the immense ocean recovery effort?What crucial technology was instrumental in locating submerged wreckage on the ocean floor?What was the general physical condition of the crew members' remains upon recovery?What percentage of the total human remains did the recovery operation manage to bring up?Which primary identifiers did forensic specialists rely on for identifying the fragmented remains?What identification method was rendered largely impossible due to the trauma and submersion?By what month did NASA officially announce the recovery of all crew remains?What direct consequence of the breakup forced the recovery operation to rely on forensic expertise over visual identification?