Project 675

NATO: Echo II

Project 675K

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
Nuclear reactors	2
Titanium hull	No
Class year	1972

Sensors

Sonar (7)

Name	Type	Platform	Passive range (km)	Active range (km)
MG-43 Gorizont	ssp		—	—
MG-509 Radian	Mine hunting	sub	—	1.3
MGK-100 Kerch Active	Hull	sub	—	3.4
MGK-100 Kerch AIR	Active Intercept		—	—
MGK-100 Kerch Cylindrical	Cylindrical	sub	1.7	—
MGK-100 Kerch flank array	Flank	sub	2.1	—
NEL-6	Echo sounder	sub	—	—

Radar (2)

Name	NATO name	Air search	Surface search	Fire control
Argument	Front Door	—	—	—
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: 2 x 53-61 , 2 x SAET-60 , 6 x SET-53 1964 - 1964: 2 x 53-61 , 2 x SAET-60 , 6 x SET-53M 1965 - 1968: 2 x 53-65 , 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 Argument 0 1962 - present: 6 x P-6 , 2 x P-6 (N)
Signal Ejector	2	—	100

Extendable devices (10)

Name	NATO name	Capabilities	Max depth (m)	Max speed (kn)
Argument FC Radar	—	Fire control	—	6.5
ARP-53 RDF	—	Direction finder	—	6.5
Attack periscope	—	Periscope (attack)	—	6.5
Graphite-1 Radio antenna	—	Radio (VHF)	—	6.5
Iskra-1 Radio antenna	—	Radio (LF, MF, HF), Radio navigation	—	6.5
Kasatka-B satcom/targeting	—	Radio (UHF), Satcom, Satcom target	—	6.5
MRP-10 Nakat ESM	—	ESM	—	6.5
PZNG-10 Search periscope	—	Periscope (observation)	—	6.5
RDP	—	Snorkel	—	6.5
RLK-101 Albatross Radar	—	Radar	—	6.5