Castle crew on Twitter + episode commentary + describing Stana’s water scene in "In the belly of the beast"
Andrew: She did a lot of the stunt work here, Stana did. We had somebody in, but she wanted to do a lot of it.
Rob: I don’t think I used the double except when I couldn’t have Stana. So, Stana did every single shot that she was available to do, which I think was 95% of them. I couldn’t even tell you which shots aren’t Stana. I would just play along that every single one of them is.
Andrew Marlowe, Rob Bowman, David Aman episode commentary