They mention this in some of the audio tapes or someone talked about it. I believe the machines were collecting bodies to experiment on them but later stopped. I guess they learned enough about us. As the bunkers were strategic points they would have been hit early on by the machines and therefor those bodies would have been some of the first taken.
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The crater was created by the reaper tank. It popped up when the reaper was added and the reaper blueprint can be found there. It was in the underground bunker we see ruins of and was able to blow itself out.
Yes, but it’s unclear what exactly happened. I mean what kind of explosion. How was it triggered, etc. There is no info on this, only visual evidence And the fact the Reaper was introduced, which sparked a lot of ideas, and conjecture.
Well, the reaper does have an attack that causes a massive explosion, so probably that.
Yes probably the thermobaric blast in combination with explosives/fuel in the underground bunker. Still there are also nuclear theories. Also the why is untold, was it deliberate or accidental?
So it’s not a story fact yet.
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Well, we know the reaper is one of FNIXs own creations, as seen in the blueprints description. He took over a prototype of a new tank shortly before the invasion and made it his own. With that in mind, I’m guessing it’s deliberate.
Discussion moved to proper topic.
//Mod
Maybe bunker 66(6) is a maintinance entrance for the tunnels at the crater? so what if bunker 666 is a way in
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Does anyone know what happened to cause all the destruction in the farmlands?
If you do let me know I can’t figure it out
I believe it is the events from cataclysm day.
Same discussion topics merged.
@Iris read the above replies to find out most plausible theories.
//Mod
Ok I know I asked what it is but I think I have a theory the Reaper didn’t do it at all but it was manufactured there or had some relationship with the place. I understand you’ll all say “It was the Reaper what are you talking about” just hear this. The crater was just a test by FNIX for something far worse something like all the tank classes merged into one really big really deadly and really hard to get to spawn. If you did make it spawn you would most likely need something like ever type of tank in one region all max level, including the Reaper and the ln you’ll face FNIX’s prized champion (it would most likely appear away from you) and I have a feeling if any of this is true then Avalanche could intend that this is a kind of final boss that might be spawned and downright controlled by FNIX and is spawned someway else than rival relation. If you liked this theory just hit the little heart 
This isn’t a theory it is a correction you see I meant not all of the types of tanks yet I meant all of the classes there are combined as if FNIX tore apart each and reassembled them into one big demonic horrifying tank.
Sorry for this I just needed to make sure you all knew what I meant or I needed to make sure those who didn’t understand, understand
BYE BYE
Your idea is similar to mine, which i posted above:
There is clear evidence in the lore of Reaper's existence. (Spoiler alert!) Click here to read.
The main assembly was already constructed: body and appearance.
Reaper before FNIX finished it, as it appeared in FOA4:
What FNIX did, was adding weaponry (from other machines), shield generators and thermoboaric explosion, thus completing the Reaper. FNIX even kept the original code name: “Grim Reaper”.
Reaper stats:
Base body
- military tank
Weapons
- shockwave stop (all tanks come with it as built-in)
- stinger/FNIX tick deployment (in use for apocalypse and FNIX class machines)
- incendiary machine gun (from apocalypse tank)
- radiated missiles (from apocalypse harvester)
- biochemical gas (from apocalypse harvester)
- anti-weapons shield
- thermoboaric explosion
With that, only Reaper weaponry is a mash-up from different machines. While the rest (and most) of it is normal.
While it’s unknown, but it is very likely that FNIX developed the thermoboaric explosion feature for Reaper and that thermoboaric explosion was the reason why Skinnarbol Crater was created. Triggered by the manufacturing error, as i theorized.
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Wow what a chance because I didn’t even read yours
Been a while, if anyone’s still watching this I’d like to move conversation to what’s in the crater.
From above, you wrote:
So, what exactly would you like to discuss about? 
Sorry if that sounded rude
No worries, it didn’t.