There are rough crossings, and then there’s the Drake Passage. A harrowing video filmed aboard a cruise ship shows exactly why the stretch of ocean between South America and Antarctica has such a fearsome reputation. Through the ship’s massive observation windows, passengers watch towering walls of dark water rear up toward the vessel. The ship pitches violently, seemingly tossed around like a kid’s toy in a bathtub as wave after wave detonates against the glass. Check out the footage below. There’s no verified wave-height measurement attached to the clip, but using the ship itself for scale, the largest seas appear to be roughly 25 to 35 feet — potentially higher. And that’s entirely plausible in the Drake, where waves exceeding 65 feet have been reported. One explorer described the passage’s steep, closely spaced waves succinctly: “They hit you like walls.” The Drake Passage spans roughly 600 miles between Cape Horn and the Antarctic Peninsula.…