http://science.howstuffworks.com/submarine.htm How Stuff Works - Submarines

http://www.njnm.com/education.html New Jersey Naval Museum

http://ussubs.com US Submarines

http://www.pbs.org/wgbh/nova/subsecrets NOVA Online - Submarines

http://www.pbs.org/wgbh/nova/subsecrets US Navy Submarines