An item reported that a new type of submarine was offered to the US government. It consisted of a with cellulose filled unsinkable float connected with the actual hull which was 1,2-1,5 metres below the surface located. The hull was fitted out with a heavy armoured turret just projected above the water surface. De ‘submarine’ stayed on the depth mentioned while moving with a horsepower of 900ihp allowing a speed of around 15 knots. The boat could be built within 8 months with as costs 360.000 frs.