Infiltrate the Brokenskull High Command to discover their plans
Speak to Petty Officer Kimitz( 919, 29, 832 ) and complete the following sub-quests from him to gain the rank of Petty Officer and gain access to the Brokenskull War Chamber. He's in the hall directly past Scabby Gabby.
For a bonus, kill Captain Reezz Seablood while you are there (IF you are in a full group. She is 78^^^ Heroic!). She has some excellent drops, including the much-sought-after Cloak of the Booty Hunter!