The first upgrade, introduced from the third vessel onwards during the 80s, was labeled as 949A (Antey type, NATO code Oscar II) and involved an extension of the submarine's hull to 505 feet.

A nuclear-powered Oscar II sub caught fire at its dock while ... "The source of the smoke on the submarine Orel, which is undergoing a refit at Zvezdochka, has been completely put out," shipyard ...

Argentina's Defense Minister Oscar Aguad, quoting reports from experts, said on Friday that the sinking of the ARA San Juan submarine in November 2017 was caused by a “lack of training” and ...