Project 675

NATO: Echo II

Project 675 (1965)

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	1965

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)

Ladoga

250

1962 - 1967: 2 x SET-40
1968 - present: 2 x SET-40U

533mm Torpedo Tube (forward)

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

Argument

1962 - present: 6 x P-6 , 2 x P-6 (N)

VIPS

—

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

Individual hulls (29)

Name	Short name	Country	Start date	End date
K-1	K-1	USSR	1966-01-01 (Modernization from "Project 675 (1963)")	1981-12-15 (Convert to Project 675MKV)
K-10	K-10	USSR	1966-10-15 (Modernization from "Project 675MKV")	1985-08-19 (Conversion to Project 675MKV started but not completed)
K-104	K-104	USSR	1965-01-01 (Modernization from "Project 675 (1963)")	1977-11-10 (Convert to Project 675MK)
K-108	K-108	USSR	1967-03-31 (Commissioned)	1990-03-29 (Decommissioned)
K-116	K-116	USSR	1965-10-29 (Commissioned)	1985-02-22 (Decommissioned)
K-125	K-125	USSR	1965-12-18 (Commissioned)	1971-02-02 (Convert to Project 675K)
K-128	K-128	USSR	1966-08-25 (Commissioned)	1978-12-21 (Convert to Project 675MK)
K-131	K-131	USSR	1966-09-30 (Commissioned)	1994-01-20 (Decommissioned)
K-135	K-135	USSR	1966-11-25 (Commissioned)	1988-03-22 (Decommissioned)
K-166	K-166	USSR	1965-01-01 (Modernization from "Project 675 (1963)")	1989-10-20 (Northern fleet, check port)
K-170	K-170	USSR	1965-01-01 (Modernization from "Project 675 (1963)")	1991-05-10 (Northern fleet, check port)
K-172	K-172	USSR	1966-01-01 (Modernization from "Project 675 (1963)")	1990-06-20 (Decommissioned)
K-175	K-175	USSR	1965-01-01 (Modernization from "Project 675 (1963)")	1974-02-25 (Convert to Project 675MK)
K-184	K-184	USSR	1966-01-01 (Modernization from "Project 675 (1963)")	1975-10-22 (Convert to Project 675MK)
K-189	K-189	USSR	1965-07-24 (Commissioned)	1976-12-01 (Convert to Project 675MK)
K-22	K-22	USSR	1965-08-07 (Commissioned)	1977-04-08 (Convert to Project 675MKV)
K-23	K-23	USSR	1967-12-30 (Commissioned)	1979-03-02 (Convert to Project 675MK)
K-28	K-28	USSR	1966-01-01 (Modernization from "Project 675 (1963)")	1968-10-21 (Convert to Project 675MU)
K-31	K-31	USSR	1965-09-30 (Commissioned)	1987-04-30 (Decommissioned)
K-34	K-34	USSR	1968-12-30 (Commissioned)	1982-11-24 (Convert to Project 675MKV)
K-35	K-35	USSR	1965-06-30 (Commissioned)	1986-08-01 (Convert to Project 675MKV)
K-47	K-47	USSR	1966-01-01 (Modernization from "Project 675 (1963)")	1972-01-01 (Convert to Project 675K)
K-48	K-48	USSR	1965-12-31 (Commissioned)	1990-10-21 (Decommissioned)
K-56	K-56	USSR	1966-08-26 (Commissioned)	1979-08-09 (Convert to Project 675MK)
K-57	K-57	USSR	1965-10-31 (Commissioned)	1977-06-27 (Convert to Project 675MK)
K-7	K-7	USSR	1967-09-30 (Commissioned)	1990-09-30 (Decommissioned)
K-74	K-74	USSR	1965-07-30 (Commissioned)	1992-08-28 (Decommissioned)
K-90	K-90	USSR	1965-09-25 (Commissioned)	1989-12-20 (Decommissioned)
K-94	K-94	USSR	1966-12-27 (Commissioned)	1972-10-28 (Convert to Project 675MK)