Factorio Forums

This has happened several times, ALWAYS in the exact same location. One specific water crossing that is isolated and has been a secure area since very early into my 1000+ hours. It looked like a great place to place an artillery since it was surrounded by water on 3 sides and no real way to get the back of it. Previous times before using artillery biters have simply crossed and started creating nests(expansion parties) occasionally, only twice, both in the same week. Now using artillery, I have had to fortify the position and I don't think i should have to with the water gap. To get to the position there are lots of buildings that the biters would come to first that are being ignored. Even to sneak up on it, there are other defenses that aren't being breached. See screenshots, saved games can be provided. It's just annoying now.

Unless, Biters and Spitters CAN cross water, I can't find in the wiki where it specifically states they can't. If they can, I just need to know that and plan accordingly for future expansion. For now I have fortified. I just want to know if biters can cross water(how wide of a gap), and if not, why are they?

I turned on some debug data (biter expansion) to help you see some reference
Images, max zoom to min. Red rounded rectangle is the affected area. For a little more reference, the spidertron can barely cross that gap, has to use the smallest part.
Thank you for your time, considerationa and response

Is there a save file i could take a look?

Save game is here. Apologies, should have attached in initial post.
https://www.dropbox.com/scl/fi/t0azm4yx ... igi3z&dl=0

I did some experiments with this save file and was unable to observe any issues about biters crossing water. Pathfinder was finding correct path that does not go over water and biters selected path through a bottom part with wall and gun turrets, but this wall was not enough and biters were able to reach the artillery turrets from the inside of the protected area.

I apologize. I thought I had ruled all of that out before I wasted your time.