Although she was never in fact built, the Austro-Hungarian Navy's Marine Technische Kommitee (Marine Technical Committee) submarine project of 1904-5 was an interesting attempt at submarine design on the part of capable naval architects who unfortunately lacked any direct experience of such vessels, even to the limited degree that was available in the early 1900's. Seventy-two feet long and displacing 134 tonnes submerged, the boat was a single-hulled construction clearly based on the contemporary U.S. and British Holland-type submarines, but differing from them in several important aspects, not the least of which was building the superstructure on top of the pressure hull. With a proposed crew of eight, it would have been armed with four 45cm. torpedoes carried in tandem in two tubes in the superstructure -- a unique arrangement that would undoubtedly have caused serious problems in practice: The torpedoes would have weighed so much and been carried so high above the waterline that the boat had to be equipped with a massive ballast keel to keep her upright. This increased her full-load draught to a cumbersome16 foot and limited her reserve buoyancy to a mere 3 of submerged displacement. The project became obsolete before it left the drawing board and foreign prototypes were ordered, although these were being completed when the Great War broke out and so were never delivered.