Alarm diving

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Alarmtauchen referred to Seemannssprache the sudden dangerous situations filling the ballast tanks and adjusting extreme angle of the hydroplanes while top speed to a submarine to dive as soon as possible.

The submarine is brought to one by the drive itself and secondly by the reduction in lift very quickly into deeper areas to look out for attack or threat against, for example, water bombs to protect.

Since the angle of the submarine during alarm diving and the sinking speed are very large, the crew must ensure that no parts are flying around inside the submarine and that the submarine is intercepted in good time before it reaches too great depths or even the sea bed, otherwise damage can occur.

The opposite of alarm diving is called emergency ascent or " blow out ".

Nowadays, alarm diving is tactically no longer used, as modern submarines can operate underwater for a long time in the operational area by snorkeling or fuel cell propulsion without surfacing.

However, the boats of World War II were submersible boats that mostly sailed over water and only submerged to attack. As a result, the risk of detection by aerial reconnaissance was significantly greater and a rapid disappearance from the surface was vital.