A Viking I am not...

A steel anvil would be a more worthwhile addition to this boat. The crew would be more well off to hire a thrift shop garden gnome with my face taped on.

I once knew a guy who was the manager of a local used car dealer. He had worked in that position for around 15 years before finally deciding to retire with his wife to the Keys.
One of the things he and his wife did during his first year out of work was to take a 15-day cruise to the Bahamas, Jamaica, and a handful of other sunny Caribbean destinations.

On the 4th night of the cruise, while in the restrooms during a formal dinner, he overheard a couple of gravelly voices speaking of their intentions to execute the captain, tie up the crew, and take the whole ship hostage. As they argued for and against the plan, reminding each other not to betray their nationalistic motivations, the man was inclined to warn the captain.
He attempted to sneak out of the bathroom but they caught sight of him and knew immediately what he intended to do. So, they began to follow him.

Through the dining hall, past the many tables set with silverware, and into the main atrium. In the reflections of the crystal and gold embellishments surrounding the elevators, the plotters still stood, awaiting his attention. He calmly called an elevator and held the door for them, and they hesitantly shuffled into the car.

Total silence fell as the doors clicked closed and the lift eased into motion. Eyes darted all around the enclosed space as the men prepared to start their assault. The man unbuttoned his jacket and in a blur, plunged a steak knife into the back of one of the assailants. And before the other two could react, the man pulled himself off the ground, by the knife and the handrail and kicked a heel against each of their spines, sounding a crack and sending them headfirst into the wall, rattling the moving elevator.

By the time the doors opened on the 12th floor of the ship, three men lay dead on the elevator floor and one man emerged, throwing off his bloodied blazer and booking it for the bridge.

He would soon arrive and alert the crew of the danger. But soon after, there took place a day's long game of Die Hard-esque cat and mouse between him and the countless goons that populated the distressed vessel.

As the sun rose over the Atlantic that next morning, the man would be equipped with the many weapons of their fallen. While many of the crew and passengers had indeed been captured and taken as hostages, they were freed, slowly but surely, over the course of the night and ordered down into the lower decks.

There was one terrorist remaining - one of the chief architects of the undertaking, Roger Gigliotti. He had a brief hand-to-hand encounter with the man in one of the ship's restaurants that
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https://www.youtube.com/watch?v=_JMQKc1Lt9c