In addition, the inlet is connected to a secluded bay sheltered from the strong tidal currents in the main fjord. This leads to accumulation and recycling of the exported surface brackish water, heavily reducing the sea water portion of imported water that can sink in and refresh the deeper waters, thus giving a natural stratification with stagnant (uninhabitable) water below a depth of , and a poisonous rotten bottom water beneath . As another unusual anomaly, this hydrographic blocking of seawater seems to persist in calm periods even in the winter, denying import of the usual winterly bottom water renewal that otherwise is normal in fjords, and leading to a decrease in Botn's deep water oxygen levels during winter.