What’s the secret to making a movie underwater?

The stars share their tips.

That’s where they exist."

Cameron himself has been free diving for years.

It turns out, Lang was pretty darn good at it regardless of the needs of Quartich.

“I did fine,” he says, modestly.

“I can hold my breath in a static hold for probably five or six minutes.

She and her husband, Jim Simpson, trained with Krack together, and breathing became her central focus.

Would I be able to do this?

Saldana says she leaned heavily into the training with Krack, paying close attention to every detail.

“I was making these small, little discoveries about myself.

It’s like, ‘Oh!

You have it in you.’

There’s serenity past the panic,” the actress says.

Jack Champion and Trinity Bliss have more cosmetic tips for underwater acting.

“Keeping your face relaxed and, obviously, not like a pufferfish.”

Avatar: The Way of Wateris now playing in theaters.