Hi, thanks for the comment, but there is no way to submit a map if it hasn't been completed at least once and a score submitted. To get to the dark beam:
The only digger is at the top right. You either need to have a path of no creeper to the dark beam dig site, or use a pair of rifts - digger packets will route through them. That very same is the one of two that has no path to any dig sites. That should be suggestive enough
That being said, this is my first map, and there are a few annoyances that I'm not entirely happy about, but I submitted it after changing my mind on a bunch if things. I'm trying to balance it better and changing the solution strategy subtley.
Thanks for playing it at least.