"I'm on it."
Night Warden sneak attacks the goons from the eves of the lower levels, picking them off one by one with great efficiency and nerve strikes.
As for the hole spewing water, he fills it with an ever-expanding polymer putty solution.
After cuffing the goons and bringing them and the engineer back to Lady Superion, he wakes one of the thugs with a slap and waterboards him until he discloses the nature of the cargo before knocking him out again.
Night Warden then simply growls, "Let's finish this."