USA. nuclear powered submarines can go faster than 25 knots (nautical miles per hour) underwater.
in the water
Pink dolphins are like submarines because they never go in the water, dolphins and submarines alike are have waterphobia and never go in the water. Pink dolphines also are lesbians like submarines
USN Gato class subs in WWII could about 20 knots surface, and about 9 knots underwater.
As submarines go deeper they are surrounded by more and more pressure from the water arround them. There are not currently any submarines that can withstand that amount of water pressure.
Most submarines have propellers that spin, pushing them forward. A few smaller research submarines use a water jet for propulsion.
That is the most efficient shape for fast, silent, speed underwater.
According to Wikipedia the US Navy has: Los Angeles class (29 in commission, 2 in reserve) – fast attack submarines Ohio class (18 in commission) – 14 ballistic missile submarines (SSBNs), 4 guided missile submarines (SSGNs) Seawolf class (3 in commission) – fast attack submarines Virginia class (19 in commission, 1 delivered, 1 fitting out, 7 under construction, 2 on order) – fast attack submarines The existing fleet of ballistic submarines currently carries 54 percent of the United States' nuclear deterrent arsenal.
submarines are important because people need to go under the sea and do what they got to do to save the world
10 mph underwater 20 mph surface
The current total is 71 active and 2 reserve as of May 2011 - Commissioned 14 SSBN's (Ballistic Missile Submarines) 4 SSGN's (Cruise Missile Submarines, converted SSBN's) 53 SSN's (Fast-Attack Submarines) Reserve 2 SSN's (688-class Fast-Attacks) The USS California, the newest Virginia-class SSN, is scheduled for commissioning in October 2011, with another 4 on the way.
there are far more than two main kinds of submarines. The only two sections I can think of to separate them are fast attack and Boomers or Ballistic Missle.
The current total is 71 active and 2 reserve as of May 2011 - Commissioned 14 SSBN's (Ballistic Missile Submarines) 4 SSGN's (Cruise Missile Submarines, converted SSBN's) 53 SSN's (Fast-Attack Submarines) Reserve 2 SSN's (688-class Fast-Attacks) The USS California, the newest Virginia-class SSN, is scheduled for commissioning in October 2011, with another 4 on the way.