The Defiance Mk.1 is a Submersible Airship from the Server called Airship Pirates.

Airship Pirates is a Minecraft Movecraft Roleplay Server. Information can be found here: https://www.planetminecraft.com/server/airship-pirates-survival/

One of the Factions on this server was KRW (Kiton Reef Wreckers). This Nation had a number of warships designed for its Navy. The Defiance Mk.1 is part of this Navy and is a Light Cruiser. The Nation Now No longer exist, these are Outdated Design's on the Server.

The Ship is armed with Three Turreted Cannons, Each dispensing 12 tnt at a maximum range of 250 blocks. The guns can also have adjustable Arc. As well as 5 Fireguns along each side of the Vessel. Every cannon and Firegun can be controlled from the Bridge.

The Guns will only work in 1.9 to 1.12