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During world war 2, the immediate course of action for preventing Japan from getting supplies was to carry out submarine tours near the south. Ships that were believed to be carrying items meant to supply Japanese soldiers were often torpedoed down.
During World War I, Germany's goal in returning to unrestricted submarine warfare in 1917 was, quite simply, to bring the long war to a quick end. Realizing that this decision could bring war with the United States, German leaders calculated that their submarines would end the war before American involvement could make a difference.
Because one cannot fight a war without supplies. No supplies=no war.
Unrestricted Submarine Warfare. This German policy promised that any ships bringing supplies to the British Isles would be sunk by u-boats and was the only one of Germany's strategies that left the battlegrounds, thus the only one which threatened America.
In the early days of submarine warfare, there were rules that everyone followed when attacking ships. If a submarine was attacking a ship that wasn't obviously a warship, they were supposed to show themselves to the ship, tell them they were going to sink that ship, and then make sure that the crew and civilians were safely off the ship before it was sunk. During World War I, the British had such a large navy that the German navy could not defeat it, and the British were able to stop other ships from bringing food and supplies to Germany. Not only that, but the British could have food and supplies sent to England without much fear of the Germans stopping them. The Germans decided do anything they could to break the British blockade, and to stop food/supply shipments from reaching England. This meant stopping the old rules of using submarines. However, without the old rules for warning ships that they were going to be sunk and making sure the non-military people were safe, this tactic angered countries who weren't involved in the war but had their ships sunk. The USA was one such country...
A nuclear powered submarine can remain submerged for as long as it has fuel rods and supplies for the crew.
Brazil
Without breathing, the world record is 22min With air bottles (scuba diver) or in a submarine you can of course stay longer. In a submarine when you have enough supplies, you can stay virtually forever under water.
To cut Britain, Europe and Russia off from deliveries of badly needed supplies.
Submarines can pump sea water into or out of ballast tanks, if they wish to change their weight (of course, anything that enters or leaves a submarine will also change its weight - people, supplies, weapons, etc. - but if you just want to change the weight, the easiest way is to pump water into the submarine).
Some of the important events were:1898 - Spain loses the Spanish American War. The Philippines becomes a colony of the US.1899-1902 - The Philippines declares independence and starts the Philippine - American war (US wins).1907 - As a step toward independence, an elected Philippine assembly is convened.1916 - The US promises eventual independence.1935 - The Philippine Commonwealth is created.1942-1945 - Japanese occupation of the Philippines (after defeat, the US still supplied Philippine Guerrillas with supplies and support).1944-1945 - Allied forces finally liberate the Philippines.1946 - The Philippines is granted independence in the Treaty of Manila.America has helped us to not be overwhelmed by other countries and preserve our own homes where we grew in the Philippines.
George W. Heise has written: 'Philippine water supplies' -- subject(s): Water-supply
Sonar and depth charges, fuel for anti submarine frigates and destroyers.
The Electrical Officer reports to the Chief Engineer. They are responsible for the electrical systems of the submarine. That will include the power supplies, batteries, and internal communications.
A German submarine attacked and sank a cruise ship because it believed that it was carrying weapons to Britain. 128 Americans were killed on it. This was an immediate cause for America to stop sending supplies to Germany.
They expected the British would stop their attempts to free continental Europe from German control if it was difficult to receive supplies from abroad, particularly from the US.
Its a pressure vessel like a submarine but without any engines used to explore the depths of the oceans. Its life support is supplied by a surface vessel that pumps air to the bathysphere and supplies it with electricity and communications.