Project 659 / Echo I
Project 675 / Echo II

Specifications
	Project 659 / Echo I	Project 675 / Echo II
Displacement (tons):	4,500 tons surfaced 5,500 tons submerged	5,000 tons surfaced 6,000 tons submerged
Speed (kts):	20 kts surfaced 25 kts submerged	20 kts surfaced 23 kts submerged
Dimensions (m):	110.0 meters long 9.0 meters beam 7.5 meters draft	115.0 meters long 9.0 meters beam 7.5 meters draft
Propulsion	2 pressurized-water nuclear reactors steam turbines; 25,000 shp 2 shafts 5-bladed propellers	2 pressurized-water nuclear reactors steam turbines; 30,000 shp 2 shafts 5-bladed propellers
Endurance:
Crew	about 75	about 90
Armament:	6 - SS-N-3 6 21-in (533-mm) torpedo tubes (fwd) 4 16-in (406-mm) torpedo tubes (aft)	8 - SS-N-3 or 8 - SS-N-12 6 21-in (533-mm) torpedo tubes (fwd) 4 16-in (406-mm) torpedo tubes (aft)
Electronics	Radar Front Door or Front Piece targeting Snoop Tray Surface Search Sonar Herkules Fez	Radar Snoop Tray Surface Search Sonar Feniks low-frequency

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