I'm a former Navy submarine officer. While this idea is nice, it's a marginal risk factor. It's difficult to detect a wake, and you can only detect them when

I'm a former Navy submarine officer. While this idea is nice, it's a marginal risk factor. It's difficult to detect a wake, and you can only detect them when a submarine is near the surface. What really matters is being quiet. Noise transients can be heard for miles, and whether a submarine is shallow or deep. And that's why 50+ years of research has focused on making and keeping submarines quiet. So while this technology is interesting, it's not very useful for Navy submarines.