Reminds me of the days I use to take girls to watch submarine races. Sure they can, China can do anything, You just can't see it cause. Thats more than twice the speed of other subs.

 I think China should save on expensive military spending. Instead of building things like stealth aircraft, which no one can see, they could just spread some wreckage out at night and claim..Look one of them crashed!

It probably goes at that speed when it's sinking.

I think you will find it is their version of a Manned  torpedo

I know the Russians built a torpedo using the same technology. The Americans are working on a submarine that can go that fast, but can't do so safely yet.

I suppose it is not beyond the realms of possibility that the Chinese stole the technology, and built it anyway, regardless of safety factors.

Yes, but can it sink quicker than the economy?

Down-thumb alert ! Questions on a tangent: why do communist countries feel the need to have parades displaying military hardware? How would a submarine be paraded easily?

What is the point? Sure it would be faster than other subs, but it would be noisy as hell and thus loose the primary feature of subs. Stealth. If you want speed you gotta go airborne, and 100 knots is not really speed is it. 

The Chinese armed forces lacks one important thing. They have not strategic experience. Maybe they are building up some better hardware, but it will not be used to its full capability because no one knows how to command them.

I was fortunate to tour the USS City of Corpus Christi (SSN-705) which is a Los Angeles class nuclear powered fast-attack submarine.  Now that is serious piece of military hardware!  It is my understanding that the USN submarines (particularly the Ohio and Los Angeles class) are where the world's most advanced electronic and mechanical engineering are concentrated in one place. 

factoid: One USN Ohio class SSBN carrying 24 Trident II D5 SLBM's each with 8 MIRV's carries more firepower than was unleashed in WWI & II combined. 

Perhaps the PLA Navy has a boat like this, perhaps pigs can fly too.

Fast submarines are completely useless.
I think it's another example of "look what we can do!" rather than actually something for warfare.

If you're in a submarine and you go fast, you're going to be a noisy submarine and you will be detected.  If you're detected it's very very easy to take out a sub from the air.  You just call in some planes from a carrier or a helicopter from a destroyer and drop some air-to-sea torpedoes. They'll lock onto a noisy submarine and take it out in no time at all. If you then shut the engines off and try to "be quiet" the destroyer will come over and start dropping depth explosives right on top of you. They'll know exactly where you are because they already found you.

Very very vulnerable to air attack and all the decent destroyers these days have got both helipads and depth charges for sub hunting.  

You can't outrun air forces from the water, never going to happen.  So a fast submarine does nothing against the submarine's absolute worst vulnerabilities.  So it's clearly just for show.

I've played too many war games in my life.  Hunt for Red October is one of my favorites and you win that by *NOT* being a fast moving noisy submarine!

Really bad joke...

but wouldn't a Chinese submarine be a 'yellow submarine' ?