In the middle of the Atlantic ocean, with a salinity of 3.2 %, a VLF signal will penetrate down to a depth of 10-20 meter, barely periscope-depth for a modern large scale submarine.
在大西洋中部，海水的盐度为3.2%，甚低频无线电信号可以穿透到海面下10 ~20米的深度，几乎就是现代大型潜艇的潜望镜深度。
In the middle of the Atlantic ocean, with a salinity of 3.2 %, a VLF signal will penetrate down to a depth of 10-20 meter, barely periscope-depth for a modern large scale submarine.
在大西洋中部，海水的盐度为3.2%，甚低频无线电信号可以穿透到海面下10 ~20米的深度，几乎就是现代大型潜艇的潜望镜深度。
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