Hull Breach

Hull Breach is a main quest in the Fallout 4 add-on Far Harbor.

Part 1
(P.S. You can eliminate machete mike and loot the caps from his corpse leaving the option to continue with the other quests )
 * 1) Talk to The Mariner about helping. She will ask you to bring some power tools from the Eagle's Cove Tannery.
 * 2) Optional: Ask for a raise in payment and she'll throw in a custom shotgun.
 * 3) Travel there, clear out the ghouls, pick up the power tools in the basement.
 * 4) Leave and run into Machete Mike. He will offer to buy these power tools for 2000 caps (2750 with a persuasion check). At this point, you can sell them and lose out on subsequent quests from the Mariner for an instant pay-off or refuse and bring them to The Mariner for a lower payout, but two more quests.

Part 2

 * 1) The Mariner wants to expand the Hull using an actual ship hull. MS Azalea is a natural candidate, but has one problem: There are already people living inside.
 * 2) But since they're trappers, the solution is to serve an eviction notice - using projectiles of your own choice.
 * 3) Sweep through the ship murdering everything in your path. Once the trappers are dead (technically, Bilge is enough, but you don't want those raiders to live, right?), return to the Mariner.

Part 3

 * 1) To protect the Hull against Mirelurk Queen attacks, The Mariner will ask for three mirelurk carapaces.
 * 2) This can be accomplished very simply. Find and kill three mirelurks. This is easiest when doing the Rite of Passage.
 * 3) Deliver them.