The designer of the submarine put it up on his blog.
They do some good pieces of mecha art too so you should check it out.
You can see the post here if you like.
I got reminded today, but the submarine here looks really similar to the one from the Arpeggio of Blue Steel manga.
I wonder why. Well eventually that sub detaches the extra weaponry to become a more normal looking sub.
Great minds must think alike.
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