Episode 179 - The Ultimate Showdown Starts! Luffy Faces Off Against the Pirate King's Army

Episode 179
The Greatest Battle Begins! Luffy vs. the Pirate King's Forces
Japanese: 最高の戦い開始！ルフィVS海賊王の軍団
Saikō no Tatakai Kaishi! Rufi VS Kaizoku-Ō no Gundan

The crew uncovers more secrets about the island’s ruins and the connection between the ancient civilization and the Void Century. They discover a hidden chamber that contains vital information about the One Piece. However, they are interrupted by a powerful enemy who has been guarding the secrets for centuries.