| | Large submarine-laboratory
Project 1840NATO:
Lima Ñlass
Completed 1
unit
Ships Leningradskoe admiralteyskoe
ob`edinenie
| Name |
Yard ¹ |
Laid Down |
Launched |
Commissioned |
Note |
| BS-555 |
¹01665 | 26.10.1977
| 11.08.1978 |
29.12.1979 | |
General characteristics - Project
1840
| Displacement (tons): | | Surfaced: | 1872 |
| Submerged: | 2564 |
| Dimensions (m): | | Length: | 85 |
| Beam: | 7,8 |
| Draught: | 6,54 |
| Speed (knots): | | Surfaced: | 12 |
| Submerged: | 8 |
| Range: | | Surfaced: | 200
nmi (12 knots) | | Under snorkel: | - |
| Submerged: | 80 nmi (4 knots),
25 nmi (8 knots) | | Diving depth (m): |
| Operational: | - |
| Maximum: | 375 |
| Endurance (days): | 25 |
| Propulsion: | 1x1900 hp 2D-42
diesel, 1x1840 hp PG-101K electric motor, 1 fixed pitch propeller in nozzle, 4
thrusters, 2x500 kW DGR-460/500 diesel-generators | | Equipment: | 1
dive complex – 300 m | | Electronics: |
RLK-101 Albatros radar, ARP-53R radio direction finder, MGA-8 sonar, MG-25
Yakhta underwater communications system, MGV-5V underwater communications system |
| Complement: | 41 |
Schematics 
Large submarine-laboratory - Project 1840
Modernizations Project 18401 – Leningradskoe admiralteyskoe ob`edinenie
(from 1992 Admiralteyskie verfi) started in 1989, but not completed. MGA-19
Krilyon sonar, MGA-22 Gletcher sonar, Mikron-M communications complex
Fleets Black Sea Fleet: BS-555
Hull Numbers BS-555: 572, 574(1986), 587(1990), 565
Decommissioned 1993 – BS-555 (30.06)
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