Eh. I have seen what people can do when they really want to achieve something. Equipment or not, there's always a chance someone could pull it off. You have no idea what humanity can do with a few tools and misplaced confidence.

[For better or for worse. Trust her, she has seen it way more times than just once.

Erin snorts a little when he asks that question, and she just...answers, a tad resigned:]

I hope you can keep that healthy skepticism intact for the rest of your life. If you do it'll be the sign you had a sane life.

[In other words, yeah, she does think this being underwater isn't impossible. Erin has seen way too much to rule anything out -- that's the kind of canon she comes from, hah]