Marine Headquarters.
They had learned a painful lesson twenty years ago.
To guard against Devil Fruit Users like Golden Lion Shiki, who could easily cross seemingly impassable barriers.
They had not only improved their communications to counter the Den Den Mushi Signal Jammer.
To ensure they received word immediately, they had installed special alarms in both the Fleet Admiral's Office and the Chief of Staff's office.
Once those alarms sounded, it meant something had happened at Impel Down.
Admiral Sengoku and Staff Officer Tsuru reacted immediately.
At the same time, the news spread rapidly through the Navy High Command.
Lights came on in house after house in the darkness. In less than a minute, they had put on their uniforms, draped capes over their shoulders, and stepped outside.
They said nothing when they encountered their colleagues along the way.
They did not know what had happened, but it was definitely serious.
Even if they could not intervene, they still had to stand by.
Meanwhile, at the harbor, Admiral Sengoku, Vice Admiral Garp, and numerous other senior officers, including Staff Officer Tsuru, had already set out.
Zephyr was left behind to guard Marine Headquarters.
All of Marine Headquarters went on high alert, ready for war at any moment.
They had to prevent anyone from launching a sudden attack while so much of their fighting strength was absent.
"Have we contacted Impel Down?"
Sengoku gazed out at the dark sea, his hands gripping the railing so tightly that it buckled under his terrifying strength.
Clearly, he was anything but calm.
If the worst had truly happened at Impel Down, there was no telling how many vicious criminals would be released.
Nor was there any telling how disastrous the consequences would be.
Much of the Navy's work over the years would go up