U boot oldalak
Figure 1
http://www.u-boot-greywolf.de/
www.uboot.nethttp://uboat.net/special/archiv/
http://sedoparking.com/u-boot-greywolf.de
http://www.navsource.org/archives/08/08248.htm
http://www.navsource.org/archives/08/08268.htm
surcouf
http://encyclopedia.thefreedictionary.com/French%20submarine%20Surcouf
Figure 2
eltünt izraeli tengerallatjaro
http://en.wikipedia.org/wiki/INS_Dakar
konfederacios u boot
http://www.sonofthesouth.net/leefoundation/Confederate_Submarine.htm
szovjet
http://americanhistory.si.edu/subs/const/anatomy/sovietsubs/
http://web.ukonline.co.uk/chalcraft/sm/ww2sm2.html
http://www.dropbears.com/w/ww1subs/index.htm
http://www.updated.com/search/?wid=18048&text=submarines
http://www.abc.se/~m10354/mar/subs.htm
http://www.submarinesailor.com/History/Trivia/MovieBoats.htm
http://www.submarine-history.com/
http://www.msichicago.org/exhibit/U505/aftcrew.html
http://www.submarine-history.com/
http://fr.wikipedia.org/wiki /U-boot
http://mapage.noos.fr/sub-scope/artcapitainesssss.htm
Figure 3
magyarul
http://tengeralattjaro.lap.hu/