Project 675

NATO: Echo II

Project 675MU

Type	SSGN
Soviet designation	PLARK
NATO reporting name	Echo II (mod)
Country	USSR
Displacement (t)	6,000
Length (m)	115.4
Beam (m)	9.3
Draft (m)	6.7
Height (m)	9.3
Max speed submerged (kn)	22.0
Max speed surfaced (kn)	14.0
Max safe depth (m)	241
Endurance (days)	60
Propeller	2 x 6 bladed propellers
Nuclear reactors	2
Titanium hull	No
Navigation system	Sila-N-675 (Automatic Dead Reckoning)
Class year	1972

Sensors

Sonar (8)

Name	Type	Platform	Passive range (km)	Active range (km)
MG-25	com	sub	—	—
MG-43 Gorizont	ssp		—	—
MGK-100 Kerch Active	Hull	sub	—	3.4
MGK-100 Kerch Cylindrical	Cylindrical	sub	1.7	—
MGK-100 Kerch flank array	Flank	sub	2.1	—
MGK-100 Kerch Mine Detection	Mine detection	sub	—	1.3
MGK-100 Kerch OGS	Active Intercept		—	—
NEL-6	Echo sounder	sub	—	—

Radar (2)

Name	NATO name	Air search	Surface search	Fire control
Argument	Front Door	—	—	Yes
RLK-101 Albatros	Snoop Tray 1	—	Yes	—

Launchers (4)

Name	Tubes	Fire control	Max launch depth (m)
400mm Torpedo Tube (aft)	4	Ladoga	100
533mm Torpedo Tube (forward) 6 Ladoga 100 1958 - 1960: 2 x 53-56 , 2 x SAET-50M , 6 x SET-53 1961 - 1963: 0 x 53-56 , 0 x 53-57 , 2 x 53-61 , 2 x SAET-60 , 6 x SET-53 1964 - 1964: 0 x 53-56 , 0 x 53-57 , 2 x 53-61 , 2 x SAET-60 , 6 x SET-53M 1965 - 1968: 0 x 53-56 , 0 x 53-57 , 2 x 53-61 , 2 x SAET-60 , 6 x SET-65 1969 - present: 2 x 53-65K , 2 x SAET-60M , 6 x SET-65M
Missile Launcher 8 Argon-K 0 1974 - present: 6 x P-500 , 2 x P-500 (N)
Signal Ejector	2	—	100

Extendable devices (10)

Name	NATO name	Capabilities	Max depth (m)	Max speed (kn)
Argument FC Radar	—	Fire control	—	7.5
ARP-53 RDF	—	Direction finder	—	7.5
Attack periscope	—	Periscope (attack)	—	7.5
Graphite-1 Radio antenna	—	Radio (VHF)	—	7.5
Iskra-1 Radio antenna	—	Radio (LF, MF, HF), Radio navigation	—	7.5
MRP-10 Nakat ESM	—	ESM	—	7.5
PR-14 Astrocorrector	—	Periscope (astro)	—	7.5
PZNG-10 Search periscope	—	Periscope (observation)	—	7.5
RDP	—	Snorkel	—	7.5
RLK-101 Albatross Radar	—	Radar	—	7.5