The Supernatural boys are heading back in time...again.

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Sam (Jared Padalecki) and Dean (Jensen Ackles) will find their way aboard a WWII submarine in episode 14, and their 1940s adventure will have the boys battle ready.

"We will be going back in time for an episode and we will be essentially spending an episode on a World War II-era submarine with American soldiers of the time," executive producer Jeremy Carver teased, according to Entertainment Weekly. "It's basically our version of Das Boot. The whole production team has just done an absolutely astounding job, so that's a really cool episode."

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Considering their angel pal is no longer a card-carrying member of Team Free Will, it remains unclear how the Winchesters will find their way to the past. Luckily, angelic time travel isn't Supernatural's only DeLorean substitute. Henry has already proved that the Men of Letters had other means of hoping from the past to the future and back again.

You can find out exactly how Sam and Dean will make the jump during episode 14. The CW has yet to announce an episode title, but you can go behind the scenes with the following photo.

Supernatural airs Wednesdays at 9 p.m. ET on The CW.

Tags: supernatural television the cw