Yeah, kimchi is a great example of an air-free ferment. It sits buried in its own brine under weights. Sauerkraut works the same way, packed tight in a jar. So @shah.lisa, lots of veggie ferments actually need to be kept away from air to avoid mold! That's why airlocks are so common for hobbyists now. It's a total shift from the old "cover it with a cloth" idea.