Project 675

NATO: Echo II

Project 675 (1963)

Type	SSGN
Soviet designation	PLARK
NATO reporting name	Echo II
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)	22.7
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	1963

Sensors

Sonar (7)

Name	Type	Platform	Passive range (km)	Active range (km)
MG-10 Kola	Cylindrical	sub	0.9	—
MG-13 Svet	Active Intercept		—	—
MG-15	com	sub	—	—
MG-200 Arktika	Hull	sub	—	1.3
MG-23 Beresta-M	ssp		—	—
NEL-6	Echo sounder	sub	—	—
Plutoniy	Hull	sub	—	0.9

Radar (4)

Name	NATO name	Air search	Surface search	Fire control
Argument	Front Door	—	—	Yes
ARP-53		—	—	—
MRP-10 Nakat		—	—	—
RLK-101 Albatros	Snoop Tray 1	—	Yes	—

Launchers (4)

Name	Tubes	Fire control	Max launch depth (m)
400mm Torpedo Tube (aft) 2 Ladoga 250 1962 - 1967: 2 x SET-40 1968 - present: 2 x SET-40U
533mm Torpedo Tube (forward) 4 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 Argument 0 1962 - present: 6 x P-6 , 2 x P-6 (N)
VIPS	2	—	200

Extendable devices (11)

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
Bow hydroplanes	—	Bow hydroplanes	—	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