After taking care of the pirates, Admiral Nevelet interrogated the captured ones and found out the reason why they were here. It turned out that the plan that the pirates were hatching was of a very big scale. None of the rank and file pirates knew about the actual plan and only the captain was aware of it who was currently dead. But still the sailors knew that the plan was of a very big scale because the Black Death were not the only pirate gang participating in this but there were five more pirate groups participating whose strength was similar or greater than the Black Death.
But for the time being Elena's crew did not need to worry about this. The Black Death was here to guard this area and all the other groups were far away making preparations for the plan. So in a short amount of time none of the groups would be able to arrive here. That was the reason why they did not need to worry about it in the short term.