Just walk on board and take her (20 FATE)
From Fallen London Wiki
| Spoiler warning! This page contains details about Fallen London Actions. |
From: The Swift Zee-Clipper, at Last
A little bird told you when the ship will be virtually empty. Well, it was a bat, but the principle is the same. You could bribe the few crewmembers that remain on board.
Unlocked with 
1000 x Jade Fragment
Locked with 
The Heart
Cost: 20 FATE
Success
No reward narrative information available for Fate-locked actions.
You have a new Accomplishment... An Explorer of the Unterzee -!
An occurrence! Your 'Discovered: Mutton Island' Quality is now 1! (hidden)
An occurrence! Your 'Swift Zee-Clipper' Quality is now 1!
Your 'Acquiring a Ship' Quality has gone!
