Willem Dafoe who’s playing Nuidis Vulko in Aquaman, was recently interviewed by Screen Crush regarding details of his character and filming water scenes within the movie. Defoe goes on to explain how his character in the film differs from the character in the comics, pointing out that his character in the film doesn’t look like the one in the comics.
As for filming the water scenes, Dafoe goes on to explain how they’re done.
On his character:
There’s been some adjustments. Not even adjustments – it’s like anything, you use the source material and something is born from that. But I don’t really look like he does in the comic, and his role is slightly different. He is an advisor, but he’s also sort of a mentor to Aquaman.
On filming his scenes:
Most of my scenes are underwater. Some are not. So much of it, because we’re talking, and shooting underwater is a lot of ways impractical because you’re limited to what you can do with sets. It’s more about shooting them dry for wet, and then the effects do certain things to give the water feel. But we aren’t doing the scenes underwater, but we are in harnesses and on wires. There is movement. It’s not like were all sitting around pretending were underwater like this [stands up still], we’re swimming around, we’re moving. So that should be really beautiful.