The Mariner is among the heaviest steamjacks built for nautical warfare. The undisputed king of ocean combat, it can continuously fire on an enemy vessel with its heavy gun while its own ship maneuvers for the kill. When boarding begins, a Mariner can clear an entire deck of defenders with a single sweep of its deadly anchor.
The Mariner is perfectly adapted to its role at sea. Based on an innovative laborjack designed to work completely underwater for a limited time, its chassis includes watertight seals, exhaust valves, and a special boiler and piping system that cycles air from internal spaces into the engine while immersed. Its ingenious stabilization compensator enables it to endure the roughest seas without toppling over. In fact, the Mariner is so reliable in difficult waters that crews often strap themselves to its chassis during storms.