Ridley Scott's "Gladiator II" starring Paul Mescal has a scene in which a naval battle occurs in the Colosseum. Here's how accurate the event is.

That battle between the Corcyreans and Corinthians precipitated the Peloponnesian War, in 434 BCE, so would have taken place a little over 500 years before it was recreated in the Colosseum.

"Gladiator II" cinematographer John Mathieson breaks down flooding the colosseum for a shark battle.

It turns into a battle with gladiators and the Emperors’ guards falling into shark-infested water. To set it up, Mathieson explains the sequence was actually shot twice.

"Gladiator II" shows the Roman Colosseum as it likely never was: filled with water and sharks in order to host bloody sea-battle re-enactments.

But did the Colosseum actually get flooded with water and sharks in real life? It’s a question that’s warranted given Scott often plays fast and loose with history.

The lack of water also means that the Colosseum never had sharks swimming around, waiting for people to fall in.

That battle between the Corcyreans and Corinthians precipitated the Peloponnesian War, in 434 BCE, so would have taken place a little over 500 years before it was recreated in the Colosseum. Meanwhile ...