The latest updates and spoilers for the live-action "Aquaman" movie reveal King Atlan's tomb. Reddit user DC_cinematic posted a behind-the-scenes photo of the film featuring Arthur Curry and Mera inside the Atlantean king's ancient tomb. There are also reports the DC film will have a PG-13 rating and film director, Zack Snyder, has been credited as executive producer.

The film's story will take place after the events of the "Justice League" and Arthur has been called back to Atlantis to claim the throne from his haft-brother, Orm (a.k.a. Ocean Master) and prevent a war between his kingdom and the surface.

The search for King Atlan's trident

According to Comic, the leaked behind the scenes photo featured Jason Momoa and Amber Heard's characters looking over a hologram projection of Atlantis's first ruler, King Atlan, hinting that they are inside his tomb. The reason for this is that the two are looking for his legendary trident, which has the power to control ocean life.

Only those who have Atlan's blood can wield its true power and Arthur must use it to unite the seven tribes of Atlantis and stop the threat of war to the surface world. Orm also seeks the trident and will do everything in his power to claim it and put his plans into motion.

Orm will need help from Black Manta as he has a vendetta against Arthur for killing his father.

It was previously reported that Black Manta will join forces with Dr. Stephen Shin against Aquaman in a rumored post-credits scene, hinting a possible sequel in the works depending on the film's blockbuster success.

Cast member Yahya Abdul-Mateen also confirmed on Twitter that Black Manta's son, Kaldur'ahm (Aqualad) will not be part of the film.

PG -13 rating and Zack Snyder credit

According to Cinemablend, Warner Bros. Pictures officially announced that the "Aquaman" will be rated PG-13. While the rating is a standard for superhero films, the real reason behind it is that the movie is credited for having "sequences of sci-fi violence and action, and for some language."

Aside from the film rating, Warner Bros.

also announced that film director, Zack Snyder, has been officially credited as executive producer for the movie alongside his wife, Deborah, former DC head Geoff Johns, Jon Berg and Walter Hamada.

Snyder is known for helming and producing DC films such as "Man of Steel," "Batman V Superman: Dawn of Justice," and "Justice League."

"Aquaman" will premiere in cinemas on December 21.