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Navy SEALs
Navy SEALS is a part of Naval Special Warfare Command (NSWC) and the maritime component of the US Special Operations Command (USSOCOM). Its acronym ‘SEAL’ is derived from the capability to operate at sea, in the air and on the land, but its ability to work underwater makes them unique.
922 Questions
How does a scuba diver control their depth?
WARNING: A BIT OF MATH FOLLOWS
A diver's buoyancy is determined by the mass of the water they (and their attached equipment) displace. Water density varies with temperature and salinity, but a good rule of thumb is that 1 cubic meter of water "weighs" about 1029 kilograms. That pencils out to about 64 pounds per cubic foot.
A typical diver displaces about 2.5 to 3 cubic feet of water. That's equivalent to about 160 to 192 pounds of sea water. Let's assume the diver displaces 2.5 cuft of water. That means that the water they displace will "support" 160 pounds. If the diver weights less than 160 pounds, she'll be positively buoyant and will float. If she weights more, she'll be negatively buoyant ad will sink. The ideal circumstance that a diver strives for is to be neutrally buoyant, so no energy is expended to keep from sinking or floating.
If our diver and her gear weigh 160 pounds, she'll be neutrally buoyant. In practice, our diver will carry enough weight to make her approximately neutrally buoyant. If she inhales air from her scuba cylinder, her chest cavity will expand, displacing a higher equivalent weight of water, and she'll ascend. If she exhales, she'll displace less water, and will descend.
This ideal neutrally buoyant state allows a diver to ascend and descend with minimal effort. In practice, however, things are constantly changing during a dive. Wetsuits compress with depth, meaning the deeper our diver goes, the less water she'll displace. So as she descends, she'll have a tendency to descend more quickly.
Her scuba cylinder displaces a constant amount of water, but the more air is used, the less it will weigh. This means that our diver will have a tendency to become more positively buoyant... she'll "float" more... as the dive progresses.
In order to adjust for all of these variables, divers wear a "Buoyancy Compensation Device" (BCD). This is generally a vest shaped bladder that can be inflated using air from the scuba cylinder. It is fitted with a dump valve that allows fine tuning of the amount of inflation, and thus the amount of water it displaces.
During a dive, our diver will adjust the amount of air in her BCD to maintain neutral buoyancy. Then she'll use her breathing to make fine adjustments in her vertical position.
Divers diving in colder environments will often use a dry suit in place of the wet suit worn by most recreational divers. This dry suit is filled with variable amounts of air from the scuba cylinder, much the same way a BCD is. A dry suit can be used alone, or together with a BCD, to control buoyancy.
In all cases, a diver will use a depth gauge, or a dive computer which measures depth, to monitor their depth throughout a dive.
How is buoyancy used by scuba divers?
SCUBA divers control their buoyancy to keep off the sea floor or from floating up to the surface, to avoid obstacles both above and below them, and to have a more relaxing dive with minimal physical effort. As a diver changes depth, they need to either add or release air from their buoyancy compensator (BC or BCD) to maintain neutral buoyancy. A diver in control of their buoyancy can move through the water with minimal fin input and breath control making the dive a lot more enjoyable (not to mention longer due to not using a lot of air inefficiently to maintain buoyancy control).
Buoyancy is not really used by scuba divers, but it does act against them. Since the human body and the gear during scuba diving is held up by the water, especially at farther down depths of the ocean, where the water is more dense because of the weight of the water and the air holding it down. Because of the buoyancy, the divers have to wear weights to offset this buoyancy. Since in scuba diving you use wetsuits, and since these suits have nitrogen bubbles to assist insulation, this makes you float even more. And since your cells contain lipids and other materiels that are lighter than the water, this makes you float even more. This means that scuba divers must use weights to offset the buoyancy.
What are the pressure changes in scuba diving?
Let's take a moment to define some terms. The typical value used to represent air pressure at sea level is 14.7 pounds per square inch or 14.7 PSIg. You can think of 14.7 pounds as the "weight" of the entire column above a one square inch surface. For convenience, this pressure is also termed one "Atmosphere" or atm. The formal definition of one atm is 1.01325 x 105 pascals. Think of one atm as "about 15 PSIg".
Unlike air, water has the property of not being compressible. The means a given volume of water "weighs" the same, regardless of depth. Accordingly, water pressure increases linearly with depth. It increases about 1/10 atm for each foot of sea water, or 1 atm every 33 feet.
A diver at 33 feet of sea water is under a total pressure of 2 atm - one atm of air and one atm of water. At 66 feet, the total pressure is 3 atm, and so on. At 660 feet, the total pressure is 21 atm (660/33) of water plus one of air).
How much money do you get paid for racing a funny car?
Force, on the other hand, will race in relative obscurity even though he is bidding for a record 105th tour victory while trying to fend off Castrol Syntec teammate Tony Pedregon in an ongoing bid for an unprecedented 10th consecutive series championship. The media fascination with Schumacher and the Grand Prix circuit is puzzling to Force who, nevertheless, is impressed with the fact that a race car driver of any kind can command a salary that reportedly is $30-40 million per year even before endorsements. Force's take home pay from drag racing is considerably less although, based on actual racing miles, the two compensation packages are probably closer than one would think.
* http://nhra.com/2002/events/race20/reports/J_force.html
What is the record depth for a deep sea diver?
Tanya Streeter, born in Grand Cayman on 10 January 1973, set the women's free diving record in 1998 with a dive to 113 meters (370 feet). In 2002 she set the overall unlimited free diving record with a dive to 160 meters (525 feet) near the Turks and Caicos Islands.
Ms. Streeter's overall unlimited record was broken in 2004 by Frenchman Loïc Leferme who made a dive to 171 meters (561 feet). Mssr. Leferme died while training to surpass that record on 11 April 2007 at the age of 36. Ms. Streeter continues to hold the women's free diving record.
On 14 June 2007 Leferme's record was broken by Austrian Herbert Nitsch with a dive to 214 meters (702 feet) in Spetses, Greece.
SCUBAAccording to Guinness, the deepest dive ever made from the surface by a diver on open circuit SCUBA was made by 52-year-old South African engineer Nuno Gomes. Gomes made the dive to 318.25 meters (1044 feet) in the Red Sea on 15 June 2005, beating the 313 meter (1027 feet) record set by Mark Ellyatt in Thailand in 2003. He was in the water for more than twelve hours. Gomes currently holds the official Guinness record for this dive.Shortly after Gomes made his world-record dive, Frenchman Pascal Bernabe reached 330 meters (1083 feet) on open circuit SCUBA near Corsica in the Mediterranean Sea. Made on 5 July 2003, this record-setting dive has not been certified by Guinness but has been independently verified. Guinness no longer certifies deep diving records due to concerns for health and safety.
South African Verna Van Schalk holds the women's record for deepest open circuit SCUBA dive with a dive to 221 meters (725 feet) in fresh water cave Boesmansgat (Bushman's Cave) in South Africa in October 2004.
Australian commercial pilot Dave Shaw holds the record for the deepest dive from the surface on closed circuit SCUBA (rebreather) for a dive he made to 270 meters (886 feet) at Boesmansgat on 24 October 2004. This is also the deepest recorded cave dive. Shaw died on 8 January 2005 at Boesmansgat while attempting to recover the body of Deon Dreye who had died assisting Numo Gomes a decade earlier. Shaw had discovered Dreye's body on his record-setting dive in 2004.
Saturation DivesAll of the dives mentioned above were made by divers descending directly from and returning to the surface. Humans have made much deeper dives from diving bells, submerged habitats and from dry deck shelters on military submarines. Commercial divers working at saturation pressures have made dives at nearly 2000 feet of sea water. It is believed that military divers have worked even deeper. Atmospheric Diving SuitsAtmospheric Diving Suits are articulated hard diving "suits" which allow a diver to descend to great depths while maintaining surface atmospheric pressure. More akin to submarines than traditional wet or dry suits, Atmospheric Diving Suits are designed to withstand the tremendous pressures found in very deep water. The most famous ADS is the JIM Suit, seen in the James Bond film For Your Eyes Only and the sci-fi film Deepstar Six. Oceanographer Syliva Earle set a human depth record of 381 meters (1250 feet) using a JIM Suit in 1979.Newer generation ADS designs such as the Hardsuit 2000 and WASP 3 are designed to operate as deep as 2500 feet. Current ADS designs typically operate tethered to support vessels. Vancouver-based Dr. Phil Nuytten's Exosuit ADS is "swim-able" allowing the diver to operate independently. The current Exosuit is rated to 304 meters (1000 feet) and has an estimated crush depth in excess of 608 meters (2000 feet).
Why do scuba divers wear wetsuits?
you don't, you can dive naked if you'd like.... but you can also go snow skiing in the nude as well... it's all a matter of comfort. wetsuits help you retain heat and water removes heat 25x faster than air, so you DO get chilly faster in water... a great simple description is located here:
What is the motto of Lebanese Navy SEALs Regiment?
Lebanese Navy SEALs Regiment's motto is 'Dare to Join'.
How much money was Tobey McGuire paid for Spider-Man 3?
ALOT considering he saved the world and stuff
Should celebrities join advertisements?
from a seller's perspective, yes, celebrities should join advertisements because it will help their sales. however, from a celebrity perspective, celebs should really look at the product. i mean, they're helping sell these products and if they don't believe in supporting the product then they shouldn't. in the past they had celebs advertise cigarettes. obviously, they don't do that now, but that's why there was such a high rate of smokers. nowadays, celebs who might advertise McDonald's or subway will see many kids and adults alike going to those restaurants. that's why it's really important that the celebrity believes in what he or she is selling
The official Seals motto is: "Ready to Lead, Ready to Follow, Never Quit"
Other navy seal qoutes are:
"The only easy day was yesterday!" another is "dont bother running, you will only die tired"
AND alone i am lethal as a team i donomaite
There are several other notable quotes from and about Navy SEALs, but there are two that stick out in my mind:
"Sure I am this day we are masters of our fate, that the task which has been set before us is not above our strength; that its pangs and toils are not beyond our endurance. As long as we have faith in our own cause and an unconquerable will to win, victory will not be denied us." Outside a SEAL Training Facility, by Sir Winston Churchill
"We want to be in a situation under maximum pressure, maximum intensity, and maximum danger. When it is shared with others, it provides a bond which is stronger than any tie that can exist."
- SEAL Team Six Officer
I know plenty of Navy SEAL motto's, because my father was in SEAL team 4. He was KIA though.....anyway, one of course is " The Only Easy day was yesterday " there are many more like " If it dont suck we dont do it " also one very similar " If it was easy it wont done right " then there's " i will do nothing to dishonor my country, my home, my platoon, my navy. " Navy SEALs are full of motto's i cant think of them all, the main one you hear is only easy day was yesterday, OH one more is " So you want to be a Frog-Man huh? "
Is SBS better than the US Navy SEALs?
They are equal.
Each branch of the armed forces has its own special forces units. In all cases, the units are extremely well trained for the missions that they are designed to accomplish. They are not expected to be able to do the same things, so it would not make sense to try and compare the two types of units.
What year did the navy seals start?
Though the SEAL's had their beginnings in WWII and more formal beginnings in 1961, the Navy SEAL teams were officially established in 1962 by President Kennedy. Most of the first SEAL teams were comprised of members from UDT units.
Who is better marines or the special forces?
You're comparing apples and oranges. Special Forces is one distinct function of the Army (though the Marine Corps now does have units under the jurisdiction of SOCOM), whereas the Marine Corps is an entire branch of the service.
Are there Green berets in the Marine Corps?
To my knowledge no. The Green Berets are Army Special forces and without enlisting in the army you wouldn't be able to join. A possible exception to this may be in the Delta Force. But the Marines recently made a special forces unit just as good if not better than the Army Special Forces. Keep in mind though that any special forces training is ridiculously hard, usually requires you to have field experience, and often times people come to you instead of vise versa. So its not really like just signing up for the swim team.
When did Tecumseh join forces with british?
i dunnoe but i think the battle of tippecanoe or something i really needed help with that question too DO YOU KNOW when tecumseh joined the war of 1812?
What region is the U.S Naval Academy located?
The U.S. Naval Academy is located in Annapolis, Maryland, which is about 30 miles south of Baltimore, on the coast of the Chesapeake Bay and near the mouth of the Severn River. It's about 40 miles (as the crow flies) NE of Washington, D.C.
When did the green berets start?
Special Forces Major Herbert Brucker was behind the beginning of the green beret designation in the year 1953. Brucker began the designation which would later be realized by First Lieutenant Roger Pezelle who adopted it for his highly operative A-Team called the Operational Detachment FA-32. Rapidly, this little green beret would be seen on the members of the special forces units whenever these soldiers went out into the field. However, the US Army was not keen on making the green beret an authorized entity at that time.
How many US Navy SEALS have been killed in the Iraq War?
a grand total of 84 active duty usn deaths as of 12/09/07 with 12 being USNR and 72 being USN.
What are the ranks of Canadian navy and air forces?
OS - Ordinary Seaman
AB - Able Seaman
LS - Leading Seaman
MS - Master Seaman
PO2 - Petty Officer 2nd Class
PO1 - Petty Officer 1st Class
CPO2 - Chief Petty Officer 2nd Class
CPO1 - Chief Petty Officer 1st Class
NCDT - Naval Cadet
ASLT - Acting Sub-Lieutenant
SLT - Sub-Lieutenant
Lt - Lieutenant
LCdr - Lieutenant-Commander
Cdr - Commander
Capt - Captain
Cmdr - Commodore
RAdm - Rear-Admiral
VAdm - Vice-Admiral
Adm - Admiral
