Submarines

The phrase "as useful as a screen door on a submarine" is a metaphorical expression used to convey the idea of something being completely ineffective or pointless in a given situation. A submarine is designed to be watertight, so having a screen door on it would be absurd and serve no practical purpose. Therefore, when someone says this phrase, they are emphasizing the futility or absurdity of a particular action or object in a humorous way.

Well, isn't that just a happy little question! When a submarine wants to escape an attack, it often dives deep into the ocean and changes direction to throw off its pursuers. Just like painting a beautiful landscape, sometimes you have to make a few adjustments to find your way to safety. Remember, there are always peaceful waters waiting for you on the other side.

Submarines played a crucial role in the war effort by disrupting enemy supply lines and sinking enemy ships. They were able to operate covertly underwater, making them effective in surprise attacks and intelligence gathering. Submarines also provided valuable reconnaissance and surveillance capabilities, helping to gather information on enemy movements and positions. Overall, submarines significantly impacted naval warfare by adding a new dimension of stealth and strategic advantage.

The instrument used in submarines to observe the surface of water is called a periscope. A periscope consists of a long tube with mirrors at each end, allowing the viewer to see objects above the water's surface while the submarine remains submerged. The periscope's mirrors reflect light from the surface down the tube to the viewer, providing a view of the surroundings without the need to surface the submarine.

Another name for a submarine is a submersible. Submersibles are watercraft that can operate underwater, typically used for military purposes, scientific research, or underwater exploration. These vessels are capable of navigating beneath the surface of the water for extended periods of time, often equipped with advanced technology for communication, navigation, and life support systems.

The term "Rig for Red" is actually an older term, since most submarines today use broadband Blue lighting for night operations. Many spaces on older boats still have Red lighting, though.

"Rig for Red" is normally a command used in the Control Room. It is normally used when the boat is going to be surfacing or coming to Periscope Depth at night. The purpose is to give the lookouts and the officer designated to head to the bridge upon surfacing a chance for their eyes to adjust to darkness, or the OOD the same thing before looking through the Periscope. However, with the change to Blue, often times Red glasses are also used to provide the same effect and then Control is changed when the command is given to surface or come to PD.

During Battle Stations and at night, many spaces are rigged for red in order to simulate night conditions. While submerged underwater during normal operations, the only real reference for the time of day is the meal being served, since most boats operate on an 18 hour rotation and not a 24 hour rotation (6 hours on watch, 12 off). The red/dark conditions are more so people can sleep rather than to simulate night. Underway, the sleeping areas are always dark unless it's a cleanup day, a drill is going on, or Battle Stations has been sounded.

Though the sleeping areas are still configured for Red lighting, tactical spaces and the Control Room were changed to broadband Blue lighting in the 80's when it was determined that the color was easier on the eyes under normal working conditions over lnog periods. I always hated it - a lot harder to catch an undetected nap in the corner than it was when Red was used.

The first submarine was built by the state of Massachusetts. It was called the "Turtle" and was designed by David Bushnell in 1775 during the American Revolutionary War. The Turtle was a one-man vessel intended for use against British ships, but it ultimately did not achieve its intended military objectives.

Submarines allow scientists to observe deep-sea organisms and their behavior in their natural habitats, which are otherwise difficult to access. By studying these organisms and their environments, scientists can gain insights into marine ecosystems and biodiversity. Submarines also enable researchers to collect samples, conduct experiments, and take high-resolution images and videos of underwater environments.

Chemicals aren't used to make O2 on board modern submarines; they use electrolysis to separate the Hydrogen and Oxygen in DI water, then store the O2 in tanks outside the pressure hull. The hydrogen is bled overboard as tiny bubbles (in the wine.... make me feel happy...make me feel fine).

There is a normal CO2 scrubber system that filters CO2 back into oxygen much the same as the space shuttle. In case of emergency oxygen Sodium Chlorate candles are used which give off an enormous amount of oxygen when its activated.

Submarines have to be very strong because when they are deep under water, there is a great deal of pressure exerted on them by the water. A hollow container underwater is not like a fish underwater, since the fish's body is filled with fluids (blood or other bodily fluids) that are no more compressible than the surrounding water is. Air behaves differently, it is compressible, so the hull must be strong.

Created by a series of complex processes, submarine canyons continue to be carved by sporadic turbidity currents waterfalls of sand, gravel, and muddy sediments.

The largest submarine ever constructed was the Soviet Typhoon class SSBN. Capable of sneaking into US terrortory without being noticed. It can carry up to 20 SS-N-20 Ballistic missiles. It has a length of 170m, A width of 23m and a draught of 12m. It is capable of 22.22 knots and had a combined power of 608800HP. It is also armed with 9K38 Igla SAM, 2x650mm torpedo tubes, RPK-7 anti-ship missiles, Type 65K torpedos, 4x533mm torpedo tubes, RPK-2 Viyuga cruise missiles, and Type-53 Torpedos It could dive up to 500m

A ridge is a geological feature that features a continuous elevational crest for some distance. If the ridge is under the ocean or sea, then it is called a submarine ridge.

The submarine telescope was not invented by an individual but rather refers to a scientific concept of placing a telescope in an underwater observatory to observe celestial objects. This concept is still being developed and researched by scientists and engineers.

because when deep sea fish are brought up to the surface after living in such extreme pressure areas for their entire lives, the lack of pressure on them causes them to puff up. so basically, it's because the pressure greatly decreases.

It is not recommended or safe to make a homemade submarine. Building a submarine requires specialized knowledge, materials, equipment, and rigorous testing to ensure safety and functionality. It is best to leave submarine construction to professionals and certified engineers.

There are quite a few advantages to nuclear propulsion on a submarine.

1. Operational cost - While up-front construction costs are expensive, long term maintenance and operational costs are lower given the lack of need for fuel supplies for the main engines.

2. Range - Nuclear powered boats have unlimited range between refueling stops ( 5-10 years), and are only limited by crew / maintenance requirements. By comparison, their Diesel-Electric counterparts are limited in range by the amount of fuel they can carry.

3. Tactical Speed - All modern nuclear submarines are designed to escort/scout ahead of fleets/battle groups, and as such have great sustainable speed underwater (the old Russian ALFA fast-attack was known to achieve 45 knots submerged). DE boats just don't have that capability, as it drains their batteries too quickly.

Speed is also a great advantage when there's a torpedo headed toward you and you need to evade it.

4. Tactical Equipment - With increased electrical generating capacity comes increased equipment capability, and therefore overall tactical capability. Even in bigger boats, they just cram in more equipment; crew habitation comes second, though it's fairly comfortable by most shipboard standards.

5. Atmospheric Regeneration - Nuclear power allows for machines that constantly regenerate the atmosphere while submerged, generating oxygen and removing Carbon Monoxide/Carbon Dioxide/Particulates from the air. DE submarines do have regeneration capability, but it's limited, and that also limits crew size and overall tactical capability.

Even so, the air does get a bit stale after a couple of months if you don't bring in fresh air.

6. Water generation - Water distillation achieved by using the steam from reactor allows for thousands of gallons of water to be made daily for crew use.

7. Civilian Emergencies - Most people don't realize it, but all nuclear powered vessels have the capability of reversing their electrical generation flow from ship to shore in the event a city or town loses its power generation in a disaster. The amount of water generated can also provide thousands of gallons of fresh, potable water to disaster survivors.

There are three disadvantages to nuclear propulsion:

1. Spent fuel rods - The first is the need to deal with the used fuel. In years past, spent fuel was recycled into weapons-grade material for nuclear weapons, but since arms limitation treaties were signed, spent fuel has become a problem, particularly since environmentalists keep trying to block the opening of the Yucca Mountain Nuclear Waste disposal site.

In coming years this won't be as much of a problem, as there is development proceeding on "lifetime fuel", or reactors that are fueled for the life of the submarine.. This means that they won't have to refuel every several years as they do now, but will go 30 or more years before the need arises.

2. Sinking - If a nuclear powered boat sinks from enemy action or accident, radiation can possibly enter the ocean, but this hasn't yet proven to be a problem with the several known boats that have sunk over the past 50 years. Submarine reactor vessels are constructed to withstand extreme pressures and explosion damage to avoid such problems.

3. Noise - All nuclear powered boats, as do shore reactors, use active cooling systems, which mean active machinery coolant pumps. The main engines and turbine-generators are also powered by steam generated by the reactor.

The additional noise generated by the steam and machinery makes nuclear powered boats much noisier than their DE counterparts; however, advances over the past 50 years in ship silencing have reduced the underwater noise range of nuclear powered boats to rival that of DE submarines running on the battery.

People need a submarine or dive bell to protect themselves from the immense pressure experienced at deep underwater levels. Submarines and dive bells are designed to withstand high pressures and provide a controlled environment for divers to safely explore these depths without risking injury or death.

The deep blue crushed glass used in laundry is typically referred to as "laundry bluing." It is added to white laundry to help maintain or enhance whiteness by counteracting yellowing or dinginess caused by mineral deposits or detergents. Laundry bluing works by reflecting light, making clothes appear brighter and whiter.