Production may be in full swing on Aquaman, but stars Jason Momoa and Amber Heard still have time to pose for a photo with director James Wan on the Queensland, Australia, set of the Warner Bros. film.

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Heard, who reprises her role as Mera from Justice League, tweeted the photo of their "water break" on Thursday evening.

Few details are known about the plot of Aquaman, but Wan has promised a "swashbuckling action-adventure, sort of high seas adventure story" in the vein of 1980s classics like Raiders of the Lost Ark and Romancing the Stone. He teased that it's "ultimately a quest story," but has yet to reveal what the object of that search might be.

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One theory is that the plot revolves around the Trident of Poseidon, but considering that Aquaman follows the events of Justice League, we can't discount that Mother Boxes play a role.

Arriving Dec. 21, 2018, Aquaman stars Jason Momoa as Aquaman, Amber Heard as Mera, Patrick Wilson as Orm/Ocean Master, Willem Dafoe as Nuidis Vulko, Nicole Kidman as Queen Atlanna, Dolph Lundgren as Nereus and Yahya Abdul-Mateen II as Black Manta.