The weapon described is a depth charge.
Submarines todaee are used for underwater exploration,funn,new life underwater.
To detect underwater mines and submarines.
They are used for scientific research as well as warfare. Smaller submarines were used for scientific research (underwater animals, plants, etc.)
periscope
World War I submarines were primarily used to locate and attack surface cargo and warships.
Submarines are built with a special design that allows them to be faster underwater. Submarines can be used during a war as a way to sneak up to enemy lines in the water, but still stay hidden.
Yes, they used Midget submarines to attack the harbor bridge. The attack lasted 4 minutes but every shot was well short of it's initial target.
There were several bombs used on Pearl Harbour it was not a one bomb attack.
A torpedo is a self-propelled underwater weapon with an explosive warhead. It can be launched by aircraft, ship, or submarine, against surface vessels or submarines. Torpedoes use monopropellants (e.g., Otto Fuel) as engine fuel, which has its own oxidizer, since there isn't any oxygen to sustain a combustion engine underwater otherwise.
A bomb and some Japanese.
It uses echo location for all underwater submarines and when the signal comes back you will be able to see whats in front of you.
SOund Navigation And Ranging = SONAR Sound is used underwater to bounce off objects. The reflections back can be measured (by electronics) to find our where they are and how far away. Used by submarines, to navigate round obstacles underwater and detect other vessels.