The Phaserl


When French Sub ‘Sank’ a US Carrier the Story Couldn’t Be Suppressed Quickly Enough

from Russia Insider:

n March 2015, one of the largest nuclear-powered warships in the world was “sunk” by one of the smallest.

The Saphir, a French nuclear attack submarine, reportedly penetrated the defenses of the aircraft carrier USS Theodore Roosevelt and scored simulated torpedo hits on her. The incident, originally reported by the French Navy, was later suppressed.

On March 4th, 2015 the French Navy announced in a blog post that the submarine Saphir (“Sapphire”) had simulated stalking and killing the carrier USS Theodore Roosevelt. Not only was the nuclear-powered aircraft carrier simulated sunk but an unknown numb

Here’s what the world knows: according to the French navy blog post (saved and reproduced by the RP Defense blog), the exercise between Saphir and the USS Theodore Roosevelt Carrier Strike Group took place before an operational deployment. According to the French navy, the carrier strike group included several Ticonderoga-class guided missile cruisers and Arleigh Burke-class destroyers, and a Los Angeles-class nuclear attack submarine.

According to U.S. Naval Institute News, Carrier Strike Group 12 (CSG 12) departed Naval Station Norfolk and Naval Station Mayport on March 5th for a Middle East deployment. CSG12 included the carrier Roosevelt, the Ticonderoga-class cruiser USS Normandy and Arleigh Burke class destroyers Winston S. Churchill, Forrest Sherman, and Farragut from Destroyer Squadron 2 provided escort.
The blog post explained that the pre-deployment exercise, which occurred off the coast of Florida, took place in two phases. The first phase involved the Saphir integrated with U.S. Navy forces to locate enemy submarines and pass data on to other friendly anti-submarine warfare assets. The “enemy submarine” in this case may have been the Los Angeles-class nuclear submarine attached to CSG 12.

In the second phase of the exercise, the Saphir switched sides and became part of the enemy force. The French nuclear submarine was teamed up with U.S. Navy P-3C Orion and P-8 Poseidons. Saphir was to locate the Roosevelt and get into position to sink her. As the exercise scenario degenerated into a shooting war, Saphir was given permission to attack. The submarine reportedly “sank” Roosevelt and “most” of its escorts.

After the exercise was over, Saphir’s commander met with Rear Admiral Richard Butler, Commanding Officer of Carrier Strike Group 4 and Vice Admiral Nora Tyson, Deputy Commander, US Fleet Forces Command.

The French Navy’s blog post was announced on Twitter on March 4th, but was quickly deleted. Several defense outlets picked up on the deletion, and the state-sponsored RT (Russia Today) crowed that a “major vulnerability” had allowed Saphir to penetrate Roosevelt’s screen. That was pure speculation, as the original French Navy post does not mention any such vulnerability.

Nevertheless, the incident appears to have actually happened. The most likely explanation for the deletion of the blog post was that it was simply embarrassing to a major French ally.

Saphir is the second of six Rubis-class nuclear attack submarines built for the French Navy. Rubis is the first generation of French nuclear attack submarines—while the French Navy has had nuclear-powered ballistic missile submarines since the mid-60s, French attack submarines were conventionally powered until the early 1980s. At 2,630 tons submerged and 241 feet long the Rubis class may also be the smallest nuclear combatants ever put to sea. Each submarine has a crew of just 70 and is driven by one K48 pressurized water reactor to a speed of 25 knots underwater. The Rubis subs each have four bow torpedo tubes equipped with F17 Mod 2 torpedoes and MM39 Exocet anti-ship missiles.

How did such a tiny submarine kill a ship almost fifty times larger than itself? First of all, we don’t know the rules of engagement of the exercise. Were the Roosevelt’s escorts using all of their anti-submarine warfare sensors? Was there any prohibition or curb on their use, or were any of them declared inoperative for the purposes of the exercise?

Second, it’s important to remember that “sunk” is in quotation marks for a reason. The French F17 torpedo has a 551 pound HBX-3 high explosive warhead. It can also only fire a salvo of four torpedoes at a time, due to having only four torpedo tubes. A 551 pound torpedo warhead would probably not sink a Ticonderoga or Burke-class escort, and though it would undoubtedly damage, it would definitely not sink a Nimitz-class supercarrier. Also, given a screen of four escort ships and Roosevelt’s onboard anti-submarine warfare helicopters, a single salvo of four torpedoes was all Saphir was going to get before it was forced to withdraw.

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1 comment to When French Sub ‘Sank’ a US Carrier the Story Couldn’t Be Suppressed Quickly Enough

  • Ed_B

    “A 551 pound torpedo warhead would probably not sink a Ticonderoga or Burke-class escort, and though it would undoubtedly damage, it would definitely not sink a Nimitz-class supercarrier.”

    US subs in WW-II were armed with torpedoes that also had 550 lb. warheads that allowed them to sink over 6 million tons of Japanese shipping. A hull-contacting 550 lb. warhead is no joke, especially when detonated underwater. The shock wave that this creates can be much more destructive than a similar air-dropped bomb hitting the same ship from above. In fact, it is possible to cave in the entire side of a small warship, such as a destroyer or frigate with such a torpedo. One of these probably would not sink a super-carrier but then, any sub driver worth his pay would not be wasting ANY of his torpedoes on the escorts and would aim all 4 of them at the carrier.

    Japanese subs in WW-II were equipped with torpedoes with 950 lb. warheads that were much more powerful than the US torpedoes. These could sink carriers and even battleships with multiple hits.

    “How did such a tiny submarine kill a ship almost fifty times larger than itself?”

    Size matters not. Today’s coastal patrol boats can launch anti-ship missiles that can sink any ship in the world, if it is in range and targeted.

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