Ep 14. The Vessel

Sam and Dean come across a lead on the Hand of God - a powerful weapon capable of killing Amara. With Crowley's help, they track down a retired WWII submarine that houses the Hand of God. In order to retrieve it, the Winchesters are forced to time travel back to 1943 and infiltrate Nazi territory. While Dean goes undercover as a Nazi officer, Sam remains behind in present day to keep an eye on the submarine and fend off attacks from Amara's minions. As they navigate the dangerous waters of the past and present, the brothers realize that they may have bitten off more than they can chew.