Originally Posted by
patplan
Waldock cautioned that "it's possible it could be an aberrant signal" from a nuclear submarine if there was one in the vicinity.
Pretty darn unlikely, lets just say that's not a likely tonal off of a sub and I can't think of any good reason for anyone to spend the fuel to send a sub way down there anyway. There's nothing to see or do down there so no operational need, and there are plenty of better (and closer) places to do training. Exception would be a boat actually sent to look for MH370, but it would most certainly not be emitting that tonal...can't listen for something you're already emitting
37.5Khz was selected because it's unlikley to be caused by natural or other manmade sources. I'm pretty this is what they think it is.