[CrazyIvan]

“The Germans has developed fuel cell powered “littoral” boats that are as quiet as a tomb.”

I read an article a few years back about the Model 214 (I think it was in Proceedings). Very impressive.

[Alas Babylon!]

I believe the 212 is a better sub. It has a non-metallic hull that makes it very hard to pick up with a magnetic sensor. The 214 is the same model, sans the classified hull composite. The 214 is the export model.