underwater beacons on CVRs and DFDRs
Too bad the comm and data services via Sat are expensive and airlines elect not to use them to save money.
These types of events do not happen often. To change the batteries or beacons would require changes to maintenance programs, storage and maintenance practices, paperwork and procedures.
239 people and 1 aircraft is sadly a loss but not significant to update world fleets. They will boost up current technology available and not used on the ground.
These Frequencies are optimal for submarine operations not to mention low power requirement.
The news are babbling whatever they hear. Sad way to broadcast and educate viewers who depend on the news for information.