Good heavens, I'm ready for help. I've spent the better part of two days on this. I can even survive the elder sub but I can't get the second one down enough. It feels like I'm only missing one step but I'm stumped.
So by giving up the base and then trying to recapture it, I've been able to get it down to 0 drills, but not take away all of the shield so it remains captured.
OH! I JUST GOT IT!! My piece of advice is that transportation will take a long time between bases, so begin asap and improvise; you're short on drills. Also try messing with the launch times (I was off by only a few ticks).
I'm sorry but I'm convinced the version of the game I have is bugged and unsolvable, I've read all the hints on here but nothing seems to be working, can somebody pm me please this is the third day I've been at it, I'm going crazy!
Anyone who'd be willing to PM me, maybe not a solution, but more of a hefty hint than what's been posted here. I can't for the life of me figure this one out.
Showing 45 drillers on my Android device and I haven't been able to solve it. Oops! I'll keep trying but y'all could be on to a bug here in the iOS version.