So I added stuff to scenes or between scenes and messed up continuity. I'll have to do an editing pass eventually. But I think I still need to do a... plumping... pass of what I added and of the last couple of scenes before going forward again.
I still need to work on developing conflict, however. Now that I've introduced alien POV scenes it might be good to think of parallel conflicts on both sides, human and alien, rather than primarily conflict between them, though it would need to be that both sides need to find a satisfactory resolution or it all goes down the crapper. Some decent tension should arise from the fact that, even if they don't know what troubles the other side is having, everyone is essentially helpless if the conflicts they aren't aware of go south. The unseen danger idea.