Truth is Stranger Than Fiction

[Delta4Embassy]

Especially underwater. Most people don't know that a rocket can in fact work underwater. A recent Youtube video showed the principle in action albeit on the small bottle rocket scale when some guys were shooting them under a frozen over pond. Because the exhaust is vaporizing the water it can achieve thrust through the water without the flame being put out. More interestingly, naval development of propulsion systems using this principle are old technology. The phenomenae is called supercavitation.

www.geoffkirby.co.uk/rocket-torpedoes.pdf
from 1982

More exotic still is electromagnetic propulsion first discovered in the 60s. And generally anything possible, and silent will be of great interest to the Navy. Didn't know we had stealthy helicopters until the ObL mission, that we might have silent submarines seems plausible. And I don't mean extremely quiet ones, but completely silent ones.

Conventional wisdom says you never tell the public/your enemies what technology you have unless you have to. F-117 wasn't confirmed until some 20 years after its first flight. And then only because we'd used it in a conflict where lots of people saw it. If the average delay from first-use, to public revelation is 15 years, what we really have flying around might be kept secret for quite some time. Especially if space-capable where no one's likely to ever see it anyway.

Before thinking 'aliens' think 'military secret.' And if thinking 'military secret' think 'national security' and 'loose lips...' Speculation's fun and all, but sometimes you might inadvertantly hit the nail on the head.

 

[Book of Jeremiah]

Our submarines have been silent for years, Delta. It was the Russians who didn't have silent submarines. They sounded like a card in the spoke of a bicycle wheel - going by ... it wasn't until the CIA ignored Anatoli Galistin's warnings that the Russian moles welcomed by the CIA were men he recognized from his KGB days as a Major. - that Russia got the technology. How did they get it? From their spies who knew about SOSUS. That is why SOSUS has been declassified. The enemy has silent submarines now too. It's useless now.

The Akula Class II Nuclear war submarine the Russians had off our Texas coastline during the summer June / July? That submarine was designed and built from the ground up to be silent. That is why the Navy wasn't able to detect it even though it was sitting there for a full month. Conventional wisdom tells me that because our CIA / Govt didn't heed Galitson's warning when they had the opportunity - its too little too late.

 

[Delta4Embassy]

You're confusing ultra quiet with silent. No propeller spinning in water is silent. Might be incredibly quiet, but it's still making noise.

The current German electric subs are quieter still but still spinning props in water.

Exotic propulsion means not involving props at all are of the literally-silent type. Whether they've been deployed is the only question.

Stuff on the news last few days about flight 370 triggered the memories. Was a thing they were talking about using satellite-based lasers or radar to 'see through' the ocean to spot subs. Dunno if they ever developed or perfected that, but I wondered why if they had, they weren't using it to find 370. Or maybe they have and just can't easily reveal they have such capability?