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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

In The Hunt for Red October, the Soviet submarine captain, played by Sean Connery,

commands his crew to verify the location of a target.

Give me a ping facility.

One ping only, please.

That ping is known as active sonar.

Bob Hedrick of the Office of Naval Research, the ONR, says it's the audio equivalent of switching

on a flashlight.

You're getting information back, but you're also broadcasting your location to other ships.

You know, number one priority in the submarine is to remain undetected.

So subs can keep their secrecy by eavesdropping on other ships instead, listening for

propellers and electronics and so on.

Such methods known as passive sonar generally require a skilled operator, but researchers are

teaching machines to do it too.

They first recorded the underwater rumblings of cargo ships off the California coast,

using an array of 28 underwater microphones.

They fed that sound along with the ship's actual GPS coordinates to their machine learning

...