Of course, this is the classic steampunk vessel....
(http://1.bp.blogspot.com/-hJOSvg0Tk80/UoZDg8oZr-I/AAAAAAAAhjI/NXVc_6Emv1E/s1600/nautilus.jpg)
but hardly the only one....
(https://biomassart.files.wordpress.com/2011/04/fleetshotwip.jpg)
They need not even be vessels....
(http://41.media.tumblr.com/e25033bb5f974dec5742cb5e05a02caf/tumblr_n9j0rn39no1qfzxa7o1_500.jpg)
What can you come up with?
I think Steampunk originated in music.
http://youtu.be/NuC8fQNLd3Q (http://youtu.be/NuC8fQNLd3Q)
http://youtu.be/8OsZTJ5vfUs (http://youtu.be/8OsZTJ5vfUs)