So you're the only one who made it...

 is a Sunless Sea Random Event.

Trigger conditions
 is triggered at zee if you have the following:  Crew ≤ 2 Menaces: Crew Lost to the Snuffer ≥ 1 

Event description
Only you and one other crew-member remain. (What of your officers? Perhaps incapacitated: perhaps worse.) One of you must be the Snuffer.