Concrete submarine pressure hulls in marine environment in use today - proved for decades...
To give anybody who is interested in concrete submarine yacht construction a clear idea what is the status of modern concrete construction in marine ambient i put a couple of photos together to make my point clear that a concrete submarine yacht hull is not a highly experimental issue - In contrary - submarine concrete hulls are in use today all over the world - just in other fields of engineering...
 
So- please guys do not ask any longer questions like: "can concrete float?", "will concrete melt away in saltwater ?", "Will a concrete submarine have cracks and let water trough like a sponge? - just relax and think about the fact why the guys that build the things shown below sleep very well and trust concrete as mankinds most used and tested building material.
 
 

Image 1

Statoil's massive concrete based Heidrun platform. The legs of this platform reach over 100m down into the sea. Basicly this floating city is based on the fact that a concrete hull can withstand the ocean pressure stroms and waves all the way from surface to 100m depth during decades - without any alteration.

 

Image2

Inside the concrete leg of a drilling platform. (Troll Platform) Those engineers at the moment of the photo are tecnically "dived at 300 m protected from water pressure by a submarine concrete hull" of collosal dimension that stands vertically instead of horizontally - just flip that platformleg (in your mind) 90 degrees and add a propeller - you have a giant submarine of 24m diameter with 1m wall thickness and 300m length. This is not a new horizon tecnically speaking - it is just to see things from a slightly different angle. By the way my prototype submarine had a wall diameter ratio of almost exactly the double of troll - so it is good for water pressure at 600m including a similar security factor.

 

Image3
Grande Dixence, on the river Dixence in Switzerland, concrete dam. It was built between 1953 and 1961 to a height of 285 m (935 ft). Concrete at the foot of this dam holds a watercolumn of 285m - equivalent of 285m dive depth in a submarine.

 
Image 4
HIBERNIA CANADA, drilling platfrom 105.5m deep diving concrete submarine hull...
 
Image 5
Golf of Corinth Greece, the legs of this bridge go 70m down to the ocean floor. They where built at sea in floating status and do rest on ocean floor with very little force to enable the bridge to move in case of earthquakes - so this bridge is founded on 70m deep dived submarine concrete hulls.
 
Image 6
Seikan Tunnel - This train emerges from the depth of 240 m below the sea of japan where ist was protected during his passage by nothing else than a submarine concrete hull - horizontally in this case...
 
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