2/28/2005: The injured USS San Francisco

It's xoB again. Last month the USS San Francisco, nuclear sub, ran aground when it hit an underwater mountain. There's the result. 1 sailor was killed in the incident, and 60 injured. This story says the commander was fired although there were no underwater mountains on the charts he was given.



You won't see this very often. And if you happen to meet any of the sailors that were aboard, they won't tell you the story. Submariners have a tradition of secrecy sometimes referred to as "silent service" - silent like the ships they run, they will not tell you a single tale about their time at sea.

I'm a little amazed that the U.S. Navy is the source of these photos. All they did for secrecy was cover secret electronics in the nose with the tarp before the pictures were taken. It's obviously a good thing the inner hull wasn't breached. This picture shows how much room there actually is between the outer hull and the inner hull.

I don't see the sonar sphere. If the sphere isn't visible then enough of the hull wasn't compressed to reach the people tank. I'll try to find a graphic.

Edit: A really hi-res of the second pic is here .

Ok, it looks like the (crushed) pinkish cluster in the middle may be the sphere, but there is a watertight hatch between the sphere and the people tank.

Yes I'd agree that the pink bit was the sonar dome. In the hi-res pic, the green stuff looks like blocks attached to the surface behind them... maybe they're some kind of sound-deadening blocks. On Troubleshooter's diagram the big grey disk behind the sphere is probably the green block stuff in the photos.

If all that is correct then the people part is behind the launch tubes, which are behind the green blocks, and is therefore a long way back from the damaged area. Probably no water entered the people part.

Strange, I use Firefox 1.1. Of course it could be a problem because of where you're browsing from.

Seattle? The Democrats aren't THAT far out of favor!

Excuse me, but you mean

Whew.

I'm relieved to learn that the wave of version envy was just a false alarm...

might still be the where...

When that kind of tonnage meets an immovable object at -cough- 35 knots -cough-, there must be a lot of newly deaf fish in that area.

Ooh, boy

Wait until somebody does the math and tags this collision as the cause of the Tsunami.

Reading the original news reports, it looks like everyone aboard was injured to some extent or another. Good job saving it, and it's the rule of Navy command: you're responsible, even if it was unforseeable. That CO will get to retire, but he's probably done as for major command.

Quote:

Originally Posted by xoxoxoBruce When that kind of tonnage meets an immovable object at -cough- 35 knots -cough-, there must be a lot of newly deaf fish in that area.

One article I read said "flank speed" in one sentence and "around 35 knots" in another. I don't know if the author was knowledgeable but it seems it was full tilt boogie right up to impact.

Going from full tilt boogie to 0 in about 2 seconds is bad, yeah, definitely very bad, yeah, definitely...

The strength of the special alloy they use to build those things should be evident from the pics.

Imagine as you are sitting here in front of your computer, having the wall of the room suddenly and without warning fly at you at 45+ kilometers per hour. That's what it was like. Ouch. Ouch. Ouch.

The one guy that died was thrown against a pipe.

Maybe it's just my eyes, but is there a crease in the hull about a tenth of the way back?

I don't see that blip in the drawing.

The San Francisco isn't an improved 688, it doesn't have the VLS installed, so there are few differences in th eimages.

This proves that you can't listen where the mountains are with passive sonar

I wonder if the "mountain" they hit was hard rock, volcanic rock or sand/rock mix like on mountains on land?

Quote:

Originally Posted by Wormfood This proves that you can't listen where the mountains are with passive sonar

The sub did not hit bottom head on. It was a glancing blow that struck the left side of the box and scrapped down the port side. Was the sub at 30 knots or 40 knots? Does not matter. It was running a high speed. Subs running at those speeds are essentially blind if they intend to operate in their primary function - stealth. And yes, there is also clear buckling in that outer hull. This boat will be out of service for quite some time.

Existance of that underwater moutain was known. But due to the cost, charts have not been updated with recently discovered underwater topology. I believe this data was obtained from satellites.

and oh yeah - bush and rove remotely steered them in to the mountain. it took 7 minutes. damn mental midget.

Out of service for a while? Probably forever. Considering they have been taking 688 boats out of service, they'll either bring another one back, or NOT retire one that would have been retired, and the San Fran will be made into razor blades

How's that old line go?

She's going from guarding peace to guarding closeness...

Would that explain sacking the Captain?

Quote:

Originally Posted by xoxoxoBruce I had also read the Navy was aware that there were a number of uncharted obstacles in that region. They were, however, unconcerned because of the sophisticated electronics all US Warships carry should warn them of potential hazards. I guess they forgot about full tilt boogie training runs.

My understanding is it doesn't work when they run at speed because the boat makes so much noise.

It's sort of like the faster you go, closer something has to be before it becomes noticable. Think of it like trying to hear something in the car with your head out of the window.

about SSN711

This is an older submarine, and did not have bow planes or vertical launch tubes. The situation could have been much different if she did.

No water entered the people tank. Flooding is bad, and she might not have survived that. The sonar sphere seen in the diagram can be accessed from inside the submarine, but that hatch is of course pressure proof and is kept dogged at all time except when necessary to enter for maintenance of the computer equipment there. Entry is only made while going slow, shallow depth.

Hi Jimbo, welcome to the cellar.
You're saying the diagram in post #6 is not this sub, but a later design?

I just saw a tiny piece in the KC Star Friday that said several members of a sub crew were punished for running into an underwater obstacle. Presumably, they were members of the San Francisco crew?

yes. I might have a link or story on this in the archives...I'll get back to you on it

Wow! Strategy Page has a new set of photos with higher-res shots including the area under the tarp.

new report out

According to Yahoo, they've issued the report on the collision.

Although the mountain was not there on the particular charts that they were using, there was an indication of a navigation hazard in the area on other set of charts that they were supposed to look at as well.

Those "other charts" must be the satellite data I read about. They've been getting much better at looking beneath the surface with satellites.

I can hear the Captain of the vessel now...

"$150,000,000.00 to fix a dented front fender! That's outrageous! Do you know what this will do to my insurance rates?!"

Apparently damage to the USS San Francisco was more dangerous than was originally reported. Forward ballast tank was compromised. The boat remained stuck on the bottom, stern up, for some minutes before it finally and slowly floated to the surface. From the NY Times of 18 May 2005:
Adrift 500 Feet Under the Sea, a Minute Was an Eternity

Attached to the article is an interactive graphic entitled "Fighting to Save a Fallen Sailor". Notice the location of all forward ballast tanks.

Also confirmed by the article are that maps did not show the obstruction. Submarines move blind. They are dependant on maps that really only report 10% of the ocean.

Good find I can't imagine what it was like down there, waiting and waiting, for the ship to rise. And when it did still not knowing if they would make it.

Article notes that the Captain threw his command star into the grave of the sailor. A poetic expression that does say much about how the Navy works.