Description: Submarines of the Project 667BDRM (Delta IV) class entered service in 1985-1991. The total of 7 ships of this class were built, of which one has been withdrawn from service and eliminated. Submarines of this class carry the D-16RM missile system with 16 R-29RM (SS-N-23) missiles. The current plans call for keeping six 667BDRM submarines in service, so the submarines are undergoing overhaul during which they are equipped with new missiles. Launch tests of the new version of the R-29RM missile were completed in June 2004. Two submarines of this class - K-51 Verkhoturie, K-84 Ekaterinburg - have completed overhaul already.