This has been the third submarine that I have made.
Sub contains numerous materials for crafting as well as tools but built with the major flaw of being made of only glass. Contains a 10-pump ballast.

Clearly, the person who sent in the blueprints needs to be fired.

Picture: Download:http://www.mediafire.com/file/d348fxm17 ... Cannon.sub
UPDATE
Added Chlorine to the Medbay

BTE V4.6

Picture: Download:http://www.mediafire.com/file/wj362mhax ... Cannon.sub

There is only one trouble:

Admins are removing badly looking submarines. The reason they may block you with this one is: It has no background.

But submarine looks balanced and fine to me.