[the OlLine Rebel]

Sank. It is “sank”.

Off my grammar soapbox.

[RedMonqey]

“ The subs can reach speeds of eleven knots on the surface and twenty knots submerged."

???

[nevergore]

If the propulsion system is that great and we can save considerable cost over nuclear, why haven’t we adopted it?

[mylife]

Lots of countries have AIP

[Shananigator]

Subs a so yesterday technology. Satellites have tracked their ever move for 50 years.

[central_va]

The technology proved so successful that when the United States Navy leased the HMS Gotland (A-19) for use in anti-submarine warfare (ASW) exercises in 2004 it was able to “sink” the USS Ronald Reagan (CVN-76), the then newly constructed $6.2 billion dollar aircraft carrier!

LOL. What a joke. We track real enemy subs 7x24 with our SSNs and with SOSUS. We can't tell you all that so you can go on thinking they sunk a CVN...

[puppypusher]

These AIP type submarines are still powered by diesel fuel and batteries. So they are range limited and if they run into a good anti-submarine hunter team they are very vulnerable to the fact that they are diesel/electrics.

If you have no power you can’t create oxygen to breath. If you get pounced on and are forced to go down deep your going to be in a fix. I’m sure their subsurface speeds are not as good as a nuke boat as well.

[puppypusher]

Oh!In my previous comment #23 I forgot to mention that this “sinking” was simulated during a training exercise.Though it shows how important the anti-submarine forces have to be.They have to be alert 24 hours a day for just such activities.The cost otherwise would be a tremendous loss of life and a multi-billion dollar asset.

[Lower Deck]

The technology proved so successful that when the United States Navy leased the HMS Gotland (A-19) for use in anti-submarine warfare (ASW) exercises in 2004 it was able to “sink” the USS Ronald Reagan (CVN-76), the then newly constructed $6.2 billion dollar aircraft carrier! The outcome was replicated multiple times and the stealthy Swedish sub was able to “run rings” around an American carrier task force.

Anything mechanical puts out noise. For submarines it's just a matter of knowing what to look for and where to look for it. Anyone who thinks that the U.S. Navy didn't come out of their time spent playing with the Gotland knowing exactly how to track AIP subs is just kidding themselves.