These are generally anchor mines, tethered to the seabed and floating just out of sight, beneath the waves.

这些通常是锚地雷，系在海床上，漂浮在海浪之下看不见的地方。

Detecting mines that sit on the sea floor is harder than looking for anchor mines, for the water above them absorbs both radar waves and light.

探测位于海底的地雷比寻找锚地雷更难，因为它们上方的水吸收雷达波和光。