cut the top pff a round hairgel container glue to a peice of something. longait container into submarine shape. add back fins. add tank door. add tower and periscope. add guns as wish (a twinlink autogun on the front would prolly look best... kinna like a WW2 AAA gun on the front of the older subs) glue to base.. paint..... paint base in various blues to look like water then use a super high gloss.. also glossing the sub may help it look like it just emerged
reference pics....
http://www.freedesktopwallpapers.net/military/us-navy-submarine.jpg
http://www.pennantplc.co.uk/case_studies/case_study_images/submarine_300.jpg
http://www.ul.ie/tap/StudentWebProjects/Evan%20Kilroy/Evan/submarine-intro.jpg
http://s91641651.onlinehome.us/images/sub1.jpg
http://s91641651.onlinehome.us/images/subgun.jpg
http://www.mikekemble.com/ww2/war/cobia1.jpg
hope this helps
