Sea-mine made of concrete

[leif-tore]

Hello

These pictures shows what should be a sort of sea-mine, which is made of concrete.
The outer diameter is ca 80 cm, and the inner diameter is ca 50 cm.
The small hole in the top is ca 55 mm in diameter, through the steel insert.
The height is ca 170 cm.

From an eyewitness, who was a young boy during WW2, we have been told that they were made locally.
Then they were filled with something that looked like soap-bars, and then sealed in the bottom.
On the top there was a "pole" with a glassball or something similar at the end. This was the ignition for the mine.

When the mines were "set up" at the location, they were launched from a boat. They were lying on a wooden trolley with steel wheels, and was erected before they were launched.

After the war, these soap-bars were used by the locals to blast different things, from what we have been told.

Has anybody in here any information regarding this? Can someone confirm this? Pictures?

Best regards,
Leif-Tore

[StefanSiverud]

Naval mines are far from my area, but looking at it, it appears to be a variation of the Küstenmine A using more concrete and less steel.
How was the wooden bottom lid held shut?

[leif-tore]

How was the wooden bottom lid held shut?

I will Ask my source if he knows/remembers.

Leif-Tore