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[–] • 3 pts

using 2 megawatts of laser power emitted through the submarine’s coating of optical fibres, each thinner than a human hair

And those fibers will be easily damaged which will mean 2 megawatts of laser doing even more damage to those fibers. Fiber lasers don't tolerate much disturbance on the fiber, particularly on their aperture ends which need to be flat to within a fraction of a wavelength of the light they emit. Even just a little oil film or debris on the fiber ends will causes the light energy to destroy the fiber. I don't see this working in the ocean on a high speed submarine. It's just too fragile a system to work out.

[–] • 2 pts

Facts don't matter here. It's all about emotion. Come on. If they actually were remotely close to something like this, they wouldn't be telling anyone.

[–] • 2 pts

Totally agree. Add chinese manufacturing quality and ... I wouldn't want to be waging war in one. How many creatures with sharp bones will it hit at high speed? Fractured fibers become leaky and depending upon the laser power, can instantly self destruct.

[–] • 2 pts

So the things emit lots of bubbles? No way we'll detect that, nope. /s

[–] • 2 pts

I think the bubbles would condense and get absorbed by the water on its way to the surface, as long as they are deep enough. It's not air.

[–] • 2 pts

It's not air.

Oh duh, cavitation, sort of like a vacuum that will collapse on itself quickly. Thanks.

Looks like collapsing bubbles can cause shock waves and damage things in close proximity.

[–] • 2 pts

They also make fuckloads of noise, cavitation on propellers is why an electromagnetic design as mentioned in the hunt for red october has been a long term goal of everyone's submarine design programs. Chinks said they had it working last year I think.