Question: What happened to the SpaceX Starship SN11?
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As per the live streams held on YouTube, I want to know what really happened to SpaceX Starship SN11

The live streams show a lot of smoke and others show some camera footage, even others say it blew up in the sky.
And other people even say that there was an issue with the 2nd raptor engine

What is really going on here?

* Did it blow up in the sky?
* Did it blow up on the launchpad?

Why did it crash?
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1. **Computer code error**

SpaceX uses computers that run on code(correct me, anyone, if I'm wrong
here)and the SN10 flight was successful (even though it came down with quite a
bump!) so we can assume that SpaceX used the same code but altered it a bit so
they instructed the computer to reduce the velocity so it wouldn't come down
like SN10.

But there was an error with the code
2. **Raptor/s issue/s**

Or we can assume that the computer ran the code correctly, but there was a
raptor issue as shown by the fire here

[![](https://i.stack.imgur.com/LyxCU.png)](https://i.stack.imgur.com/LyxCU.png)

3. **It was caused by the fog**

Or we can also assume that everything went well but the landing wasn't
possible due to the fog. The computer could not calculate and made a botched
landing attempt
4. **Or there was/were some other issue/s**

***So which of the four was it?***

1. Computer code error
2. Raptor issues
3. Bad weather caused by the fog
4. Some other problem/s

Other suggestions and answers other than the given 4 are also welcome!

Please note that i prefer detailed answers

Answer: 
We know for certain this was a mid-air explosion. Twitter user [RGVAerialPhotograph](https://twitter.com/RGVaerialphotos/status/1377294449018081280/photo/1), photo linked but not included here because I'm unsure of copyright, shows the pad is clearly intact, and the debris is spread to the north of the pad. I've also had it on good word from someone who would know that it wasn't the FTS system. It seems like whatever happened it was a true explosion, so mixed oxidizer and fuel with a spark lead to an explosion, in something that is roughly mixed correctly.

We know the nose cone is mostly intact (But unzipped), the tank is completely shredded. We know that the event happened when one of the engines attempted to ignite, most likely the third. The remains of the nose cone landed very close to the landing pad, so it was probably mostly on target.

We also know that the CH4 header tank, right in the middle of the rocket, is pretty much in two widely separated pieces. It therefore seems very likely that the first explosion happened there.

Whatever happened must have happened mostly from the south. The orientation of Starship when falling is the nose points east, the engine point west. Incidentally, the FTS is on the side pointing downward during the fall, which would not explain the debris cloud preferentially being north.

All of this being the case, I would say some oxygen somehow worked its way in to the header tank. That oxygen likely reached the engine, causing an explosion which traced its way upward to the header tank, that completely blew up.
A recent [tweet from Elon](https://twitter.com/elonmusk/status/1379022709737275393) says that:

> 
> Ascent phase, transition to horizontal & control during free fall were
> good.
> 
> 
> A (relatively) small CH4 leak led to fire on engine 2 & fried part of
> avionics, causing hard start attempting landing burn in CH4 turbopump.
> 
> 
> This is getting fixed 6 ways to Sunday.
> 
> 
>