An Easter egg in the opening credits of Game of Thrones‘ seventh season may explain how the White Walkers will get past the Wall.
However, both the show and book series that it’s based upon open with a more primordial threat: the White Walkers.
The Wall isn’t just a physical obstacle, but is covered in magical enchantments designed to keep the White Walkers from passing under, over, or through it.
In the end, the White Walkers might simply use their abilities to freeze over the small section of the sea and march around the Wall.