Mini submarines on the territoty of East Prussia

[otis68]

Good afternoon. I'm from Russia. And I write on this forum through a translator. Therefore, I apologize for my English. I deal with the issues of underground structures on the territory of East Prussia. You may be confused by what submarines have to do with it. I have a couple of questions on this topic. First. Where you can see photos of the transportation of mini submarines. Like a beaver. And similar mini boats of the Third Reich.I am interested in the name of the trailers for transportation. And the second. There are photos of bunkers or underground structures specifically for this type of weapon.