So I went up and clear out the base. Once the worms were gone they finally stopped firing. However, the ground remained on fire for an unusually long time. Over the next few hours I checked on it from time to time, and every time the fire was still raging on the two spots where those turrets were firing. I've dubbed them the eternal flames and have come to accept them as a permanent fixture on my map.

It seems to me that the turrets forever firing at a stationary target they will never reach and the eternal flames are both probably unintentional. A save of the continuous fire and a save a few hours later with the eternal flames are available here:
https://dl.dropboxusercontent.com/u/969 ... s-fire.zip
https://dl.dropboxusercontent.com/u/969 ... -flame.zip
*EDIT*: On the eternal flame save you just need to zoom out a couple of clicks to see them. I saved zoomed in too close.
Also, on both saves if you look closely you can spot the worlds luckiest fish.
