MOSCOW, November 23 (RIA Novosti) - A Russian...

The Alrosa, a Kilo class diesel submarine, was on a training exercise in the Black Sea on Saturday when it reportedly experienced some problems with its jet propulsion system.

"The submarine is being towed in a surfaced position to the port of Novorossiisk. Its arrival is expected on Monday. Experts will establish the cause of the malfunction there," the source said.

A Russian Navy spokesman earlier said the situation on the submarine was under control and there was no danger to the crew.

He also said the submarine would continue the drills after the problem is fixed.

Alrosa, commissioned in 1990, is the only submarine in active service with the Black Sea Fleet. It is based at a Russian naval base in Sevastopol on Ukraine"s Crimean Peninsula.