The "Aluminaut" was designed at the Woods Hole Oceanographic Institution in Woods Hole, Massachusetts. A full-scale wooden mock-up was built to engineer the interior spaces. The project was classified as top-secret at that time. At that time it did not have a conning tower entry and it immediately flooded and sank. The tower entry was designed and added and in the first test, the submarine turned upside down. It was thought at that time that the design was impractical and was almost scrapped.