Soviet submarine K-56

Soviet submarine K-56

"K-56" was a project 675 (also known by the NATO reporting name of
"Echo-II-class") nuclear submarine of the Soviet Navy.

Her keel was laid down by the Sevmash shipyard.She was commissioned into the Soviet Pacific Fleet.

On 13 June 1973, "K-56" had completed test launches of her SS-N-3 Shaddock missiles in the Sea of Japan and was returning to port accompanied by cruiser "Vladivostok". She was carrying observers on board, including her Division Commander, Captain First Rank L.F. Suchkov, civilian technicians from Leningrad, and a team from her sister boat, "K-23", that included her commanding officer, Captain Second Rank L. Homenko. These 36 guests were housed in the second compartment.

At approximately 0100, the boat, running on the surface, rounded Cape Povorotny in Peter the Great Bay. The navigation crew noted a surface contact on radar about 75 kilometers (40 nautical miles) ahead, moving toward them at convert|9|kn|km/h|0. Since that was the only contact, and it would be about two hours before the submarine and the contact's combined speeds would bring them near each other, the captain felt no concern.

The boat's RLS "Albatross" radar set had been used at full power throughout the day for the missile launches and now needed maintenance, which required that it be placed in "hot standby." The captain gave permission for the radar to be secured, and relied on the lookouts to spot any hazards.

Two hours later, the radar was re-energized and four contacts were immediately detected. The operators became confused, attempting to plot courses for the contacts. Three minutes after the radar came on, lookouts spotted a ship's navigational lights. The bridge ordered evasive action, but two minutes later, the research ship "Academician Berg", traveling at convert|9|kn|km/h|0, struck "K-56" on the starboard side, tearing a four-meter hole through the hull into the first and second comparments.

As the second compartment rapidly flooded, the officers within shut the watertight doors to prevent flooding the adjacent compartments. When the seawater flooded the battery well, many of the officers and civilians in the second compartment were killed by chlorine gas.

The 22 sailors in the first compartment were able to fight the flooding and retain a pocket of air until "K-56"’s captain ran his boat aground on a sandbar.

The next day, salvage ships lifted "K-56" from the sand bar onto pontoons, and towed her to dock.

The investigating board ruled that the collision of "Academician Berg" with "K-56" was a "navigation incident with serious consequences."

A civilian expert from Leningrad, 16 officers, five warrant officers, and five sailors were killed.

References

* [http://submarine.id.ru/memory/K56.htm Книга памяти - K-56]
* [http://submarine.id.ru/sub.php?675 ПЛАРК - Проект 675, 675М, 675МК, 675МУ, 675МКВ]


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