Now you can keep your boat at periscope depth all day long!

现在，您可以让您的船民在潜望镜深度一天！

youdao

At periscope depth it can be located by the enemy's reconnaissance aircraft.

在潜望镜深度它能被敌人的侦察飞机定位。

youdao

Submarine motion at the periscope depth, will suffer the interference that comes from waves.

潜艇在潜望镜深度航行时，会受到来自波浪的干扰力。

youdao

The Royal Navy's official inquiry concluded HMS Affray sank because the snort mast, the tube through which the diesel engine "breathed" while the submarine was at periscope depth, snapped because of metal fatigue.

BBC: HMS Affray submarine sinking remembered off Alderney