Mariner's will is a paper note in the Fallout 4 add-on Far Harbor.
Location
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It can be found in the Mariner's house in Far Harbor after she has left the Island.
Transcript
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I leave the docks and all of my other property to the community. Don't let our sacrifices be in vain. Take what we've started here and build something greater. Prove yourself worthy of living on this island.
-Mariner
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