The submarine <ul><li>Submarines are ships that can operate both under and on top of the water. </li></ul><ul><li>One of the first submersible vessels was built around 1620 by a Dutchman named Cornelius van Drebbel . </li></ul><ul><li>Submarines have changed a lot since Drebbel's day . Today some submarines are 200 metres long and carry a crew of over 150. Nuclear powered submarines can stay underwater for months at a time. </li></ul>
Submarines of WW1 <ul><li>Technical developments from 1914 to 1918 greatly boosted the submarine as a weapon and as World War One developed. </li></ul><ul><li>German Deutschland class of merchant U-boats , each 315 feet long with two large cargo compartments. U-boats could carry 700 tons of cargo at 12- to 13-knot speeds on the surface and at seven knots submerged. </li></ul>Now the submarine called Kotor . This submarine was made by German .
The U-155 <ul><li>The U-155 when fitted with torpedo tubes and deck guns, and, with seven similar submarines, it served in a combat role during the latter stages of the war. </li></ul><ul><li>The U-155 was " standard " submarine of World War I measured slightly over 200 feet in length and displaced less than 1,000 tons on the surface. </li></ul>
Submarine USS 0 7 <ul><li>USS O-7 , a 521-ton O-1 class submarine built at Quincy, Massachusetts , was commissioned in July 1918. </li></ul><ul><li>When the 11 November 1918 Armistice brought the First World War's fighting to an end, O-7 returned </li></ul><ul><li>Also The submarine is using in World War 2. </li></ul>
The HAMS AE2 <ul><li>HMAS AE2 (originally known as AE2) was an E-class submarine of the Royal Australian Navy. </li></ul><ul><li>The AE2 is measured slightly over 181 feet in length and displaced less than 800 tons on the surface. </li></ul><ul><li>the submarine’s speed was 15 knots(surfaced), 10knots(submerged). </li></ul>
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