Ganzack Pirates

The Ganzack Pirates were a group of pirates led by Ganzack. They only appeared in One Piece OVA.

Ship
The Ganzack Pirates possessed a massive warship built by Ganzack to achieve his goal of conquering the Grand Line was a massive complex machine. Built beneath his fortress by the enslaved islanders Ganzack unveiled the warship after putting down a rebellion. Ultimately however with the help of the islanders Luffy, Zoro, Medacka, and Nami defeated Ganzack and sank the ship.

The warship was huge. In addition to spikes and cannons it had several special weapons. In the bow of the ship there was a chamber for Ganzack's Seamonster. On top of the forecastle was a massive dynamite gun. This weapon was capable of mass destruction.