Alright let's all take a step back here <I am speaking as a moderator>, and relax. <moderator hat off>
Without my getting into it. The points are that a submarine may have picked up the pinging and the government it was attached to may have classified that knowledge. The opposite point is it is quite likely that a submarine did not hear this (there are not that many submarines in the ocean and they generally cannot hear for thousands of kilometers), and even if they did hear these sounds (plane hitting the water, or the pinging) the crew of the submarine may not have recognized the significance.
The other point was that if you are going to claim something and you want anyone to listen to it, it is wise to demonstrate that you have some knowledge in the subject (submarines and sonar in this case).
Anyhow lets keep it civil shall we?
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