Indeed, if the clog is big/deep enough, the overflow won't work at all.[1] [1]: Flooded 4 floors of a five-star hotel by puking in a sink and falling asleep be

Indeed, if the clog is big/deep enough, the overflow won't work at all.[1] [1]: Flooded 4 floors of a five-star hotel by puking in a sink and falling asleep before turning the water off.