U-5 may refer to one of the following German submarines:
The Type UB III submarine was a class of U-boat built during World War I by the German Imperial Navy.
The Type UB I submarine was a class of small coastal submarines (U-boats) built in Germany at the beginning of the First World War. Twenty boats were constructed, most of which went into service with the German Imperial Navy Boats of this design were also operated by the Austro-Hungarian Navy and the Bulgarian Navy. In the Austro-Hungarian Navy, it was called the U-10 class.
The Austro-Hungarian U-boat fleet was created in the decade prior to the First World War. They were built to a variety of designs, many under licence from Germany. They served throughout the war against Italian, French and British shipping in the Mediterranean Sea with some success, losing eight of the twenty eight boats in service in return. They were reinforced by the Imperial German Navy’s Pola Flotilla, mainly comprising coastal U-boats transported by rail from Germany's northern shipyards to the Austrian ports on the Adriatic Sea. Following the end of the war in 1918, all Austrian submarines were surrendered to the Entente powers, who disposed of them individually. As both Austria and Hungary became landlocked in the aftermath of the war, no Austrian or Hungarian submarines have been commissioned since.
U-36 may refer to one of the following German submarines:
U-6 may refer to one of the following German submarines:
U-31 may refer to one of the following German submarines:
U-4 may refer to one of the following German submarines:
U-3 may refer to one of the following German submarines:
The U-10 class was a class of five submarines or U-boats of the Austro-Hungarian Navy during World War I. The class was similar to the German Type UB I submarine of the German Imperial Navy ; the first two boats delivered to Austria-Hungary had previously been commissioned in the German Navy.
SM U-11 or U-XI was a U-10-class submarine in the Austro-Hungarian Navy during World War I. She was originally a German Type UB I submarine commissioned into the German Imperial Navy as SM UB-15.
The Type UC I coastal submarines were a class of small minelaying U-boats built in Germany during the early part of World War I. They were the first operational minelaying submarines in the world. A total of fifteen boats were built. The class is sometimes also referred to as the UC-1 class after SM UC-1, the class leader. The Italian X-class submarine was a reverse-engineered and modified type of the UC-1-class.
The U-43 class was a class of two coastal submarines or U-boats operated by the Austro-Hungarian Navy during World War I. The two submarines that comprised the class were Type UB II submarines of the Imperial German Navy, making the two classes identical. From the beginning of World War I, Austria-Hungary had been working to increase the size of its U-boat fleet, so the Imperial German Navy, which was finding it difficult to obtain trained submarine crews, sold two of its UB II boats, UB-43 and UB-47, to its ally in June 1917.
SM UB-9 was a German Type UB I submarine or U-boat in the German Imperial Navy during World War I. UB-9 was ordered in October 1914 and was laid down at the AG Weser shipyard in Bremen in November. UB-9 was a little under 28 metres (92 ft) in length and displaced between 127 and 141 tonnes, depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. She was launched and commissioned as SM UB-9 in February 1915.
SM UB-11 was a German Type UB I submarine or U-boat in the German Imperial Navy during World War I. UB-11 was ordered in October 1914 and was laid down at the AG Weser shipyard in Bremen in November. UB-11 was a little under 28 metres (92 ft) in length and displaced between 127 and 141 tonnes, depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. She was launched and commissioned as SM UB-11 in March 1915.
SM UB-3 was a German Type UB I submarine or U-boat in the German Imperial Navy during World War I. She disappeared on her first patrol in May 1915, and was the first of her class to be lost.
SM UB-8 was a German Type UB I submarine or U-boat in the German Imperial Navy during World War I. She was sold to Bulgaria in 1916 and renamed Podvodnik No. 18, and was the first ever Bulgarian submarine.
SM UC-92 was a German Type UC III minelaying submarine or U-boat in the German Imperial Navy during World War I.
A coastal submarine or littoral submarine is a small, maneuverable submarine with shallow draft well suited to navigation of coastal channels and harbors. Although size is not precisely defined, coastal submarines are larger than midget submarines, but smaller than sea-going submarines designed for longer patrols on the open ocean. Space limitations aboard coastal submarines restrict fuel availability for distant travel, food availability for extended patrol duration, and number of weapons carried. Within those limitations, however, coastal submarines may be able to reach areas inaccessible to larger submarines, and be more difficult to detect.