Get on and build the thing
From Fallen London Wiki
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From: Build your zubmarine
Well, you're going to need materials. Many materials. Expensive materials. And labour to get the work done. But this is for science!
Unlocked with 
20 x Strong-Backed Labour, 
7 x Bejewelled Lens, 
20 x Whirring Contraption
Locked with 
The Heart
Success
Dive!
You build your zubmarine in secret. [..] Progress is achingly slow, for you must work only at night. [..]
And one day, there she is. Gleaming on the launching ramp. Your zubmarine. [..] the mysteries of the deep are yours to explore!Success Instructions: If this is your first ship, you will have unlocked a new Addressed As title. This can be selected via 'The Roof-Tops: Urchins' Opportunity Card.
You have a new Accomplishment... An Explorer of the Unterzee -!
An occurrence! Your 'Zubmarine' Quality is now 1!
Your 'Acquiring a Ship' Quality has gone!
You've lost 20 x Whirring Contraption
You've lost 7 x Bejewelled Lens
You've lost 20 x Strong-Backed Labour
An occurrence! Your 'Discovered: Mutton Island' Quality is now 1! (hidden)
