SMS Viribus Unitis on a scale of 1:25 and a total length of 6 metres, built between 1913 and 1917 by eight craftsmen of the shipyard Stabilimento Tecnico Triestino. The model is true to the original in structure, layout, and engine system. It is accurate to the point that, for instance, the painting in the wardroom of the model exactly replicates the original not only in subject but also in the painting technique (oil on canvas). The collection documents the first k.u.k. navy pilots such as Gottfried von Banfield, and the fate of the submarine fleet in World War I. Particularly noteworthy is the only surviving fragment of a k.u.k. submarine, the sail of U-20, which was sunk in 1918 in the estuary of the Tagliamento River and salvaged in 1962. The exhibition reaches its logic conclusion with the models of the Danube fleet, the so-called Donaumonitore, which had to be surrendered to the SHS-state on 31 December 1918. Tank Garden (Panzergarten) The "Tank Garden" (Panzergarten), located behind the museum building and usually open to the public from March to October, accommodates the most important combat vehicles of the Austrian Armed Forces from 1955 to the present, with the different types demonstrating the continuous advancement of tank weaponry. The first Austrian tank troops were equipped entirely with vehicles of the occupation powers, such as the M24 Chaffee, the Charioteer, the Centurion and the AMX-13. Two major Soviet World War II tank types are represented in the collection, the T-34 battle tank and the SU-100 tank destroyer, initially on display in front of the Soviet War Memorial on Vienna's Schwarzenbergplatz. Several exhibits of Austrian origin, however, are also on display here, such as the prototype of the Saurer armoured personnel carrier and the Kürassier tank destroyer, shown here in the newer A1 version. The last two armoured vehicles mentioned are still in use in the Austrian Armed Forces, just like the M109 tank howitzer, also on display in the tank garden. A Jaguar 1 tank destroyer is on display and the M60 main battle tank, in use by the Austrian Armed Forces for several years, is the largest and heaviest track vehicle of this collection. In addition, two aircraft are on display in the outdoor area in front of the museum, a Saab 29 Tunnan, also known as the "Flying barrel", and a Saab 35-OE Draken. Artillery halls The collection of