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Tom Colville has put together an excellent site that does a thorough job of covering the history of this 'til now obscured in secrecy midget sub. Lots of info and imagery. Links and references for getting additional info.
A TRULY "INVISIBLE" SUBMARINE.........MANY LAYERS OF DECEPTION
 The factory had never built a boat before and it was 75 miles from the water – not where you would expect to find submarine to be built.
ï‚· Most of even those who worked in this factory did not know submarines were being built there. Even family members of those building it did not know about it.
ï‚· Those who had built it did not know what it was to be used for. One worker had incorrectly guessed that it could be used to lay mines, although it could be used for that.
ï‚· On the classified level, its official name, Welfreighter indicated purpose number one: it would carry supplies (food, weapons, ammo and things that blew up), to clandestinely support operations behind enemy lines, but that would not be its potentially most sensitive purpose. At the end of the war its purpose was to bring recon swimmers to check out landing areas and fortifications prior to an assault or invasion. And that was the reason for its great secrecy........ It's presence in an area meant that an an assault or invasion would happen.
ï‚· They were shipped out of the plant at three in the morning, when few employees would see them and no one would be on the road.
ï‚· When outside it would be covered with a large tarp during transit and storage.
 In its operational area, should anyone spot it uncovered and out of the water it looked like a boat, a very klunky-looking awkward-looking surface boat – not at all like a submarine.
ï‚· In the water it had a very low silhouette. It would be very hard to spot at any distance and anyone seeing it close-up, in the water would consider it to either be a small, innocuous boat, or perhaps, even a new design of an inflatable.
A TRULY "INVISIBLE" SUBMARINE.........MANY LAYERS OF DECEPTION
 The factory had never built a boat before and it was 75 miles from the water – not where you would expect to find submarine to be built.
ï‚· Most of even those who worked in this factory did not know submarines were being built there. Even family members of those building it did not know about it.
ï‚· Those who had built it did not know what it was to be used for. One worker had incorrectly guessed that it could be used to lay mines, although it could be used for that.
ï‚· On the classified level, its official name, Welfreighter indicated purpose number one: it would carry supplies (food, weapons, ammo and things that blew up), to clandestinely support operations behind enemy lines, but that would not be its potentially most sensitive purpose. At the end of the war its purpose was to bring recon swimmers to check out landing areas and fortifications prior to an assault or invasion. And that was the reason for its great secrecy........ It's presence in an area meant that an an assault or invasion would happen.
ï‚· They were shipped out of the plant at three in the morning, when few employees would see them and no one would be on the road.
ï‚· When outside it would be covered with a large tarp during transit and storage.
 In its operational area, should anyone spot it uncovered and out of the water it looked like a boat, a very klunky-looking awkward-looking surface boat – not at all like a submarine.
ï‚· In the water it had a very low silhouette. It would be very hard to spot at any distance and anyone seeing it close-up, in the water would consider it to either be a small, innocuous boat, or perhaps, even a new design of an inflatable.