Sub ping.
USS Scorpion
There is nothing new in this story that hasn’t been published before.
I wonder about the author’s credibility because the Scorpion wasn’t sunk in the Med. It was sunk off of the Azores in the Atlantic. The “listening station” in Newfoundland gave detailed accounts of what happened. It was sailing East when the loudest explosion was heard, not West as it should have been. The depth, if I remember correctly, was 400 ft. Well, now I don’t know. The other depth that comes to mind is 150.