This is coolbert:
Flash. Here thanks to Harry, KTB Sharkhunters. [http://www.sharkhunters.com]
"New Russian 'hybrid' not a car, but a diesel/electric AND NUCLEAR submarine already undergoing sea trials, probably to replace the KILO Class diesel/electric boats."
[previously it had been thought that the Lada Class diesel/electric only Russian submarine was the follow-up to the Kilo!]
A "hybrid"? Combining "diesel/electric AND NUCLEAR" power plants all in one sub? This would be unusual. It is usually one or the other, NEVER both!
Such a submarine would allow for unlimited range, fast speed while in cruise mode, and then "stealth" [diesel/electric] while in the attack phase of a mission?
Such a submarine would have to be of large size? Allowing for an impressive array of weaponry to be carried on board too?
More later when available.