MODIFIED Y-CLASS SUBMARINE SEVERODVINSK SHIPYARD 402, USSR (SANITIZED)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP83T00574R000101470001-3
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: July 6, 2010
• Sequence Number: 1
• Publication Date: October 21, 1982
• Content Type: REPORT

Sanitized Copy Approved for Release 2010/07/06: CIA-RDP83T00574R000101470001-3
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CONTROL NO. Z-11543/82
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MODIFIED Y-CLASS SUBMARINE
SE EROD INSK SHI I' RD 40+2,, USSR
2. (SWN) REMARKS: THE NEWLY MODIFIED Y-CLASS SUBMARINE
1. (SWN). SIGNIFICANCE: ADDITIONAL DETAILS OF E MODIFIED Y-CLASS
SUBMARINE N=ED HERE ON ARE REVEALED. 25X1
LAUNCH RAIL A OF CONSTRUCTION HALL 1; HOWEVER SINCE 25X1
HE LAUNCH BASIN HAS BEEN PARTIALLY FLOODED AND 25X1
PREPARATIONS FOR MOVING THE SUBMARINE OUT OF THE BASIN ARE
UNDERWAY. REFINED MENSURATION OF THE SUBMARINE REVEALS TWO
DISTINCT HULL SECTIONS HAVE BEEN INSERTED IN PLACE OF THE
DISMANTLED MISSILE BAY. THEY ARE A RAISED FLAT-TOPPED HULL
SECTION MEASTJRING APPROXIMATELY 27 BY 9 METERS, AND AN AFT
SLOPING SECTION APPROXIMATELY 12 METERS LONG. THE DISTANCE
BETWEEN THE AFTER EDGE OF THE FLAT-TOPPED HULL SECTION AND THE
STERN IS APPROXIMATELY 83 METERS. THE DISTANCE FROM THE BOW TO
THE FORWARD EDGE OF THE FLAT-TOPPED HULL SECTION (INCLUDING THE
SAIL) IS APPROXIMATELY 37 METERS. THE OVERALL LENGTH OF THE
SUBMARINE IS APPROXIMATELY 147 METERS. PRIOR TO PLACEMENT IN
CONSTRUCTION HALL 1 FOR MODIFICATION, THE Y-CLASS SUBMARINE WAS
APPROXIMATELY 108 METERS IN LENGTH. THE HEIGHT OF THE NEWLY
INSERTED FLAT-TOPPED HULL SECTION CANNOT BE DETERMINED;
HOWEVER, IT APPEARS TO BE HIGHER THAN THE MISSILE DECK ON A
Y-CLASS NUCLEAR-POWERED BALLISTIC MISSILE SUBMARINE (SSBN) AND
MAY BE AS HIGH AS THE MISSILE DECK ON A D-1 SSBN. THE FUNCTION
OF THE NEWLY ADDED HULL SECTIONS IS STILL UNKNOWN; HOWEVER, IT
COULD BE WEAPONS, SENSOR, OR COMMUNICATIONS, AS WELL AS BALLAST
RELATED.
3.I I COORDINATES 64-34-39:1 039-48-29E
COMMENTS AND QUERIES REGARDING THI B NG BOARD MAY BE
DIRECTED TO 25X1
These notes have been prepared for briefing purposes only and should not be used for detailed ana-
lytical work. Their use should be restricted to the particular briefing board(s) they were prepared for
and must be considered valid only for the reporting period as indicated by the date of issue.
WARNING NOTICE
Intelligence Sources
and Methods Involved
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Sanitized Copy Approved for Release 2010/07/06: CIA-RDP83T00574R000101470001-3