The radio signals ability to penetrate water depends of the frequency and the salinity of the water.

电波穿透海水的距离取决于电波的频率和海水的盐度。

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Extremophiles comprise principally bacteria, which have the remarkable ability to thrive in conditions that would be hazardous to other lifeforms - extremes of temperature, radiation, salinity, and metal toxicity.

BBC: NEWS | Science/Nature | Antarctica's resources 'at risk'