Actor Tenoch Huerta revealed that he couldn't swim before joining the cast of Black Panther 2, despite the character being called the "Submariner".
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Black Panther 2: Namor the Submariner Actor Couldn't Swim Before Taking the Role - IGN
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Black Panther 2: Namor the Submariner Actor Couldn't Swim Before Taking the Role - IGN
Namor Actor Couldn't Swim Before Working on 'Black Panther 2' - Murphy's Multiverse
Black Panther 2: Namor the Submariner Actor Couldn't Swim Before Taking the Role - IGN
Namor Actor Couldn't Swim Before Working on 'Black Panther 2' - Murphy's Multiverse
Black Panther 2: Namor the Submariner Actor Couldn't Swim Before Taking the Role - IGN