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One point to make about drowning: Chicks don't start breathing air until day 20 or so, just before hatching when they pip internally into the air cell. And if you think about how drowning occurs, it's when you inhale water instead of air. And if you're not breathing air yet, you can't actually drown, can you? So you can't 'drown' chicks/embryos that are on days 1-18 of incubation simply because they aren't yet breathing air. Any drowning that's going to occur will only happen in the last stages of the incubation, so even if they're exposed to a too-high humidity for a few days, you CAN counter the effects of that by dropping the humidity extra low for another few days to compensate. A steady humidity isn't as important as a steady temperature, and as long as the overall moisture loss by the end of the incubation is within the recommended 11-14% weight loss, the chicks should not drown.