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Before World War 1 started, Austria Hungary had a massive and powerful navy that it used to battle its future ally, Italy. They had fought 7 different wars between 1820 and 1866. It's navy played a big part in the war.

Austro-Hungarian Navy. (2017, September 28). Retrieved October 05, 2017, from https://en.wikipedia.org/wiki/Austro-Hungarian_Navy

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Before the war started, Austria Hungary planned to use its navy and Italy's navy to block the North African 19th Army Corps
from reaching Europe. This would provide a huge advantage to their ally Germany on the Western Front. However, due to various reasons, Italy didn't want to help Austria, prompting Austria to try the plan on its on.

Blockade. (2017, September 22). Retrieved October 05, 2017, from https://en.wikipedia.org/wiki/Blockade

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Since Italy didn't want to help, Austria had to fight not only the French, but also the British all on its own. In the first few weeks of the war, the French launched a massive attack to try and break the blockade. However, all they accomplished was the sinking of a small cruiser called the Zenta.

SMS Zenta. (2017, October 01). Retrieved October 05, 2017, from https://en.wikipedia.org/wiki/SMS_Zenta

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When the war first started, no one really understood the capabilities or usefulness of submarines. It was only after a U-12 nearly sank France's most powerful battleship: Jean Bart that people really started to see how powerful submarines were. This incident also taught France to be more careful, which caused the end of battleship use in the Adriatic Sea.

French battleship Jean Bart (1940). (2017, September 28). Retrieved October 05, 2017, from https://en.wikipedia.org/wiki/French_battleship_Jean_Bart_(1940)

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George Ritter von Trapp was an austrian submarine ace. He sank 14 different vessels or essentially 61,328 tons of shipping. One of the vessels that he sank was the French Cruiser: Léon Gambetta. He even had a movie about him made called The Sound of Music.

M. (1970, January 01). Monarchist Profile: Captain Georg Ritter von Trapp. Retrieved October 05, 2017, from http://madmonarchist.blogspot.ca/2012/01/monarchist-profile-captain-georg-ritter.html

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Before the war began, both Austria-Hungary and Italy believed that control of the Adriatic Sea would be decided by one big battle. They believed this because both countries had invested a lot in their navies. However, the war didn't go the way they thought.

Europe. (2015, November 17). Retrieved October 12, 2017, from http://www.worldatlas.com/aatlas/infopage/adriaticsea.htm

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In the spring and summer of 1915, Italian and British Warships attacked the Dalmatian Coast as well as nearby islands. However, just like the French they were stopped by Austria Hungary's submarines which sank 2 Italian cruisers, the Garibaldi and the Amalfi. Thy also damaged a British cruiser, the Dublin.

Submarine. (2017, October 12). Retrieved October 12, 2017, from https://en.wikipedia.org/wiki/Submarine

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On May 23 1915, Italy's declaration of war against Austria-Hungary went into effect. The attacks began on the dawn of May 24. However, the battle was not all that impressive as the only ship that fell was the Italian Turbine.

Italy Declares War on Austria-Hungary. (2015, May 23). Retrieved October 12, 2017, from http://mentalfloss.com/article/64322/wwi-centennial-italy-declares-war-austria-hungary

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As submarines became more and more popular, the Otranto Strait became an important part of Adriatic Sea naval battle. This was due to the fact that the Otranto Strait was  the only way for German submarines to enter the Mediterranean's open waters and come help Austria-Hungary.

Strait of Otranto, The. (n.d.). Retrieved October 13, 2017, from http://atlantipedia.ie/samples/tag/strait-of-otranto/

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After 29 months of war, by the end of 1916, Austria-Hungary's navy had lost 2 cruisers, 2 destroyers, and 4 submarines. However, the Entente navies had suffered much bigger losses. They had lost 1 dreadnought, 2 predreadnoughts, 6 cruisers, 5 destroyers, and 11 submarines. But despite gaining the advantage,  Austria-Hungary would still go on to lose the war.

World War I. (n.d.). Retrieved October 13, 2017, from https://www.pinterest.ca/ddixon3694/world-war-i/

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Virtual Library. (n.d.). Retrieved October 13, 2017, from http://www.tdsb.on.ca/library/HOME/schoolno/4208

Unfortunately, citation machine for some reason didn't work, so here is the link to the website I found on the virtual library.
http://search.ebscohost.com/login.aspx?direct=true&AN=122903301&db=khh&site=hrc-live