Submarines

The top 5 are as follows. The United States has 73. Followed by China with 63, Russia with 56, and N and S Korea each has 26. Remember, these numbers are always changing.

There is no sub that goes to the Titanic. The Titanic is so deep in the cold waters that it takes a special diving bell that can go down that far and deep. Films have been made of the 2-3 trips that it has made and you can most likely find them online.

You can make one with a baby carrot, four toothpicks, and baking powder (not baking soda). You will also need a dull knife with a fairly narrow tip. Cut the carrot in half the long way. Eat the other half. Hollow out a small area in the middle of the flat side. Stick the two of the toothpicks in the round side in the front at an angle. Stick the other two toothpicks in the round side in the back at an angle. Pack as much baking powder into the hollowed out area as you can. Place in water. To see it done, go to: http://www.metacafe.com/watch/805804/baking_powder_submarine/

It depends on the water in the area of operation, but absolutely, especially from aircraft.

If close enough to a surface vessel and the water is clear enough, it can be seen as well, but not as easily.

Aircraft spotting of submarines underwater was a major concern for both Allied and Axis submarines during WWII, and the limited depth capability of those boats meant they were more susceptible to aerial attack even after they dove. T they're a lot harder to detect today (submarine sonar can pick up aircraft noise and thus either go deep or stay deep), though being detected in shallow water or clear ocean is still a very real threat. It's one reason that submarines have been painted black for decades - they're harder to spot.

Depending on the clarity of the water, submarines have been spotted from the air as deep as 400', but they're usually spotted at Periscope Depth, which is around 65' keel depth depending on the boat.

It's easier for aircraft to spot them in the clearer waters of the Pacific or the Caribbean rather than the Atlantic, but the operating depth of most boats is deeper than most aircraft can spot them anyway. You have to literally be over them and looking as well - again, black isn't easy to spot from the air against the darker background of deep ocean. Generally, the attempt is made by ASW aircraft to locate a boat by sonar (sonobuoys or dipping sonar from a helo), and then visual scanning is attempted. However, as an old submarine Sonarman, I can tell you that once an aircraft is picked up (a helo has to be low enough on the water to use dipping sonar that it can be heard, and sonobuoys make unmistakable splashes when they hit the water), a boat captain won't give an aircraft the opportunity to get a look.

As an example of the concern of being spotted from the air, during the Cold War when I was submariner, the onboard emergency buoy, which could be released in the event the boat sank in shallower water, was normally painted orange so it could be more easily spotted if released and on the surface (it had about 400' of cable). The buoy was painted black and welded to the deck if going on special ops in hostile waters so that it couldn't be spotted from the air.

All shiny metal surfaces are also painted black, so that sunlight can't reflect off of them and potentially alert an aircraft to a boat's presence.

Charleston Harbor

They have male nurses on board. They are called corpman.

There are 2 primary reasons:

1. Pressure in the boat helps to seal hull valves and other mechanical equipment that rely on seals to keep water out of the boat.

2. Monitoring the air pressure in the boat is a primary way to discover leaks or flooding; if there is a drop in pressure for no apparent reason, it's a good bet that water is coming in from somewhere.

The key to the range and duration of the modern nuclear submarine is the nuclear reactor. The reactor generates heat through nuclear fission, and this does not use air (or the oxygen in it). The heat is used to make steam, and the steam drives conventional steam turbines. With a large power source and no requirement to be on the surface, the boats can stay down for an extended period limited only by the amount of provisions they can stow aboard prior to deployment.

Believe it or not, yes - Shark attacks against submarines and submarine Towed Sonar Arrays are actually quite common, and also cause a lot of damage when they bite a Towed Array. I've seen myself shark bite damage to my old boat's Towed Array cable, and some arrays are often found with shark's teeth still in them.

Of course attacking the boat itself won't do any damage, other than chip some paint. But they see submarines as a threat in their space and act accordingly.

The conventions for naming U.S. Navy vessels has a long and varied history, dating back to the earliest days of the Republic. Today, it's pretty standard, but it depends on the type of vessel, and in special cases, the naming convention for a vessel can be changed by the Secretary of the Navy.

The most recent example of ship naming are the USS Michael Murphy (DDG-112), and Arleigh Burke-class guided missile destroyer, and the USS Michael Monsoor (DDG-1001) one of the new Zumwalt-class guided missile destroyers. Both were named for Navy SEAL's who were killed in action in Iraq and Afghanistan (Murphy in Afghanistan in 2005, Monsoor in Iraq in 2006), and were both posthumously awarded the Medal of Honor.

The Federation of American Scientists maintains a good reference list of Navy vessel types and their naming conventions. The link is below.

By using submarines, the German war machine was able to come close to America's shoreline and this surely pushed the u.s. To act

It did - one U-boat even sunk a ship in the St-Laurence Seaway, and many U-boat crews were startled by the ease with which they could torpedo ships close to the US shore until the ships' crews realised the value of black-out conditions.

When ever they were presented with targets of opportunity.

IJN subs were deployed for "fleet warfare", not merchant raiding. The costly job of sinking allied warships fell to the IJN sub fleet. It's estimated that IJN submarines sank less than 50 merchant ships during the war.

Yes, the above answer is correct. But I believe it was Winston Churchill's Rapport with the President of America, Franklin Delano Roosevelt, that led to the USA coming to the help of Britain and her Allies. At first it was lease-lend - helping with old ships, etc, but in return in Britain allowing America to set up facilities in British held territories. But, once Japan attacked Pearl Harbour, America were able to publically declare war - and America geared up to help Britain and the Allies in defeating Germany, and Japan.

A submarine has tanks that are called ballast tanks. When these tanks are flooded with sea water, the submarine sinks because the sub weighs more than the water it displaces. To rise again, the sub reduces its weight by pushing compressed air into the ballast tanks. The air forces the sea water out and sub returns to the surface. It maneuvers using its rudder and planes. A link is provided.

Almost everything in the ocean makes some type of noise. Further noise travels 5 times faster in water than it does in air and many time further. Submarines use listening devices known as passive SONAR to listen to the sounds of the ocean. It's a falicy that submarines make dangerous levels of noise. In fact a modern submarine is actually more quiet than the water that it displaces.

-sub

It floats and sink by changing its buoyancy. The primary method of controling buoyancy is the ballast tanks. The air is let out of them and is displaced by water. This gives the submarine negative buoyancy, which will get the submarine to submerge. By blowing or pumping air into those ballast tanks, the submarine becomes buoyant and rises to the surface.

It's not - the Russians have always had lower profile sails on their boats compared to Western boats. The Borei is a successor to the Delta-class submarine; the sail seems a bit longer, but the height is about the same as a Delta-IV.

The current-generation U.S.S. Virginia nuclear attack submarines cost between 1.8 and 2 billion dollars each, including the amortized development costs for designing the class (i.e. it costs about 1.4 billion or so to actually build the sub, but there were several billion in startup, R&D, and design costs for the class, which adds about .5 billion to each sub).

A typical non-nuclear attack submarine (such as the German Type 212) costs around $500 million, including the amortized development costs. Note that the typical non-nuclear attack submarine is usually about half the size (and a quarter of the displacement) of a nuclear attack sub.

The Allies referred to them to as U-boats a contraction of the translation of the German name for the vessels: Under sea boat or in German "Unterseeboot"