Just like diesel submarines travel underwater, but for much longer periods as the nuclear engine does not consume the oxygen in the air. The older diesel submarines were limited to running on batteries or using a schnorkel to get air for the engines when underwater, so usually they traveled on the surface like regular ships only submerging to prepare for an attack with torpedoes on passing enemy ships. The nuclear submarines can practically travel underwater forever, until they need to be resupplied with food for the crew.
Yes. There nuclear torpedoes that can travel underwater and destroy ships.
USA. nuclear powered submarines can go faster than 25 knots (nautical miles per hour) underwater.
Submarines todaee are used for underwater exploration,funn,new life underwater.
USA has the most nuclear submarines
Submarines?
Submarines have ballast tanks inside them that can be filled with water to make them sink.
1957 USS Nautilus. First sub to travel beneath the North pole.
Argentina had diesel-electric submarines while the British had nuclear-powered submarines.
Submarines have sonars.
A number of nuclear submarines sank, and the circumstances vary from accident to accident. Wikipedia has a list, and by going there and entering "List of sunken nuclear submarines" you can review that list.
Nuclear submarines are powered by a nuclear reactor and they are completely independent of air, so there is no need to surface frequently.
The US, Russia, Great Britain, France, China and (recently) India have nuclear submarines.