The question about drowning might have just been a misdirect for the audience, I suppose? The purpose of the actual Cold Harbor test is clear, though, they present her with a task of dismantling a baby crib, essentially giving up on the dream of motherhood that Outie Gemma had, yet their analytics show she’s feeling no pain about it, meaning their quest to separate a human completely from their trauma has worked. There’s a reason an earlier line mentions freedom from pain.

I’m left uncertain about why they wanted specifically to get ready of her after this test, though. Is that really the biggest pain they could test for? Is there a limit on innie instances? Or is it again some bullshit Kier limitation that’s part of their rituals?