Reminder: Check out the whale is a written note found in Dishonored 2.
Heard that one of the whaling ships from Santiago Fisheries brought in a big fat one, bleeding all over the docks for a while because of an argument over port taxes. I need to go take a look one of these nights, before it's totally rotten. I can probably snatch a few gallons of blood and grease to refill my ink stocks.
The note can be found during the mission Dust District, near Mindy Blanchard's bed on the top floor of her apartment.