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Sven Yrvind presents a physical model of a waterproof ventilation system designed for a 4.4-meter high-latitude boat.▶ 0:02 The system admits air through a topside intake into a sealed container; a drain at the container's bottom exits overboard through a waterlock, so air cannot escape that route and water cannot enter the cabin.▶ 0:33 A separate tube carries air from the container into the cabin.▶ 0:46 The critical feature is that the interior tube's opening sits above the water level inside the container at all heel angles — including full inversion and pitch-poling — so no water reaches the cabin even when capsized.▶ 0:48 Yrvind traces the design's evolution through several previous boats, beginning with a vessel he sailed toward Cape Horn that was later capsized and pitch-poled, then through successive improved versions where the drain progressively moved lower.▶ 3:11 The container geometry can be round or square; the key variable is the volume relationship between the drain pipe and the intake.▶ 2:19 Yrvind calls this the safest ventilation system he has built, and expects it to prevent even a single drip of water from entering the cabin.▶ 2:07

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