World War I is often referred to as the first “total war.” People at the time used this term to describe the size and devastation of the war. It helped them understand how the roles of soldiers and civilians became difficult to separate.

Why were World Wars I and II called “total wars”? Involved more nations than ever before engaged in armed combat, and the amount of military personal and civilians killed.

The war efforts needed the participation of as many people as possible. …

What became of most of the Central powers’ colonies after World War I? They became independent nations.

The correct answer is: A. The sinking of passenger liners. The use of submarines during World War I resulted in the sinking of passenger liners.

The Russian Revolution expanded the war in the east. The Russians stopped the German advance in the east. What was the most significant use of German submarines during World War I? Submarines were supposed to prevent a ground war in Germany.

In the end the German submarines had an enormous impact on the war. Over the course of the war German submarines sank 6,394 ships displacing a combined total of tons. They were decisive though; by bringing the world’s most powerful neutral into the war they sealed Germany’s defeat.

Submarines were first built by Dutch inventor Cornelius van Drebel in the early 17th century, but it was not until 150 years later that they were first used in naval combat. David Bushnell, an American inventor, began building underwater mines while a student at Yale University.

Cornelis Drebbel

A nuclear submarine can dive to a depth of about 300m. This one is larger than the research vessel Atlantis and has a crew of 134. The average depth of the Caribbean Sea is 2,200 meters, or about 1.3 miles. The average depth of the world’s oceans is 3,790 meters, or 12,400 feet, or 2 1⁄3 miles.

The Navy announced today a ban on smoking aboard submarines while they are deployed below the surface after medical testing showed non-smokers suffered effects of second-hand smoke. As with other branches of the military, smoking has long been a staple of Navy culture.

You can you survive 47 metres underwater but to do so you need to have the necessary training and experience as a scuba diver. To survive a deep dive to 47 metres down you must follow decompression stop limits or carry out decompression stops on your ascent to avoid getting decompression sickness.

The deepest point ever reached by man is 35,858 feet below the surface of the ocean, which happens to be as deep as water gets on earth. To go deeper, you’ll have to travel to the bottom of the Challenger Deep, a section of the Mariana Trench under the Pacific Ocean 200 miles southwest of Guam.

Decompression sickness: Often called “the bends,” decompression sickness happens when a scuba diver ascends too quickly. But if a diver rises too quickly, the nitrogen forms bubbles in the body. This can cause tissue and nerve damage. In extreme cases, it can cause paralysis or death if the bubbles are in the brain.

It’s a form of decompression sickness initially observed in deep sea divers. At great depths under water the excess pressure causes nitrogen gas to be absorbed into the blood. If the diver surfaces too quickly the nitrogen forms bubbles in the blood which raise havoc in the body.

If you do die in space, your body will not decompose in the normal way, since there is no oxygen. If you were near a source of heat, your body would mummify; if you were not, it would freeze. If your body was sealed in a space suit, it would decompose, but only for as long as the oxygen lasted.

Without air in your lungs, blood will stop sending oxygen to your brain. You’ll pass out after about 15 seconds. 90 seconds after exposure, you’ll die from asphyxiation. It’s also very cold in space.

Human beings can withstand 3 to 4 atmospheres of pressure, or 43.5 to 58 psi. Water weighs 64 pounds per cubic foot, or one atmosphere per 33 feet of depth, and presses in from all sides. The ocean’s pressure can indeed crush you.

However divers working regularly on offshore wind projects can earn up to £100,000 a year. Offshore divers in Scotland can earn around £600 a day. On average, they work around 120-150 days a year. Experienced saturation divers working offshore can earn £1,500 a day or more.

How Deep Can a Human Dive Before Being Crushed? There is no fixed depth where we can say for sure that a diver will be crushed once they cross a certain depth. Most recreational divers don’t generally go beyond 130 feet, but commercial divers manage to reach depths of 2,000 feet with the help of atmospheric suits.

60 feet

In the Pacific Ocean, somewhere between Guam and the Philippines, lies the Marianas Trench, also known as the Mariana Trench. At 35,814 feet below sea level, its bottom is called the Challenger Deep — the deepest point known on Earth.