Submerging

Just before diving. Electric motors forward. Ballast tanks empty but valves open.

Just before diving. Electric motors forward. Balla...

Diving. Flooding ballast tanks: the forward tank first, a few seconds later the others. Hydroplanes down.

Diving. Flooding ballast tanks: the forward tank f...

Underwater maneuvering with hydroplanes and regulator tank.

Underwater maneuvering with hydroplanes and regula...

Surfacing. Blowing ballast tanks with high pressure air.

Surfacing. Blowing ballast tanks with high pressur...

Jaa

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Submarine Vesikko the first and the last U-Boot Typ II