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.
Ok good I don’t want to sound like the rude guy
I think it was probably some swedish military remnants that used a prototype nuclear device from foa 4 to blast open the tunnels because the machines may have been using them to get around and that it wasnt the reaper because it cant fit in the tunnels.
That doesn’t mean that Reaper could be disassembled, transported on trucks or similar way, assembled, activated, went nuts’n’bolts. Also, there’s similar crater in the England where exploded artillery munitions storage (somewhere around topic).
With radioactive puddles - it’s either nuclear waste, remnants of nuclear device (be it warhead or installation), Reaper/Apoc-class rocket ammo (leaves similar dirty spots) been exploding here - either stored or shot.
My primary theory is that Reaper “emerged” there by series of it’s thermbarric fart. as evidenced by destruction within crater itself and burned surroundings, but in-game it’s blast ain’t that wide to reach beyond river to east and burn stuff to the ground or even partially collapse readiness storage bunker (also behind river)
Secondary is - powerful explosion could be result of tampered/sabotaged munitions and there was sort of sorting/rerouting station, full with explody stuff, apoc-class included.
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maybe there in the middle of the crater was a big bunker with and when the reaper went throught the roof of it it caved in and caused an explosion