What is the history behind the submarine?

[hsyylx]

What is the history behind the submarine?
i am doing a history project on the submarine used in world war 1 only!
i need to know the following:
-a thorough background description of how it was developed, including names of inventors, companies...
-its purpose/how it was used during the war
-how did it become or contribute to a post-war, peacetime innovation
-is it still used today in some way

any information would be great, thanks :)

[starshiy]

Very good. A new Heralkles
My Dear
You are going to a huge task. Every developed country can claim part of main achievements in submarines development.
Here are some links you can start with
http://www.historylearningsite.co.uk/br ... d_war_.htm
http://en.wikipedia.org/wiki/U-boat
www.deeptorm.ru (in Russian, sorry !)
http://history-world.org/world_war_i_an ... marine.htm
I hope it will help.
Regards