Cruise Disasters: What the Official Reports Actually Found

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Search for cruise disasters and you will find the same ten stories, told the same way, with no ship named and no date given. “The cruise ship that lost power and drifted for days.” “The massive wave that crashed through windows.” They are written to be read, not checked — and an earlier version of this page was one of them, which is why it has been rewritten from scratch.

The interesting thing is what happens when you go and read the actual investigation reports. Official accident investigators are not in the drama business. They spend a year working out what went wrong, and the answer is almost never a rogue wave or a freak event. It is an oil level. A rusty bollard. Something mundane that somebody already knew about.

Here are two cruise ship accidents where a national safety board published its findings, and what those findings actually say.

Viking Sky, 2019: a ship’s length from catastrophe, because of oil levels

On 23 March 2019, the cruise ship Viking Sky lost propulsion in heavy weather off Hustadvika, an exposed stretch of the Norwegian coast, with 1,374 people on board. Helicopters winched passengers off the deck one at a time through the night. It made every news bulletin in the world.

Five years later, in March 2024, the Norwegian Safety Investigation Authority published its report. The cause was not the storm. It was the engines running with too little oil in them: the blackout came from “insufficient lubricating oil in all of the operating diesel generators’ lubricating oil sump tanks, in combination with pitching and rolling in rough seas.”

The oil was within what the crew understood to be a working range. The problem was that on a ship rolling in a seaway, a sump tank does not behave like a tank sitting still. The investigation found the tank design “did not comply with SOLAS II-1, Part C, Regulation 26.6 and LR Class Rules Part 5, Chapter 1, Section 3.7 on safe operation under dynamic inclination nor with the recommendations of the engine manufacturer.”

Two further findings are worth sitting with. It took 39 minutes from the blackout until both propulsion motors were operational — 39 minutes of a large cruise ship drifting towards a lee shore in a gale. And the report is blunt about the departure: Viking Sky had left Tromsø two days earlier with one of its four diesel generators unavailable, without the redundancy required under Safe Return to Port rules, and the NSIA concluded the ship “should not have departed Tromsø under the prevailing circumstances.”

The report’s estimate of how close it came is the line that stays with you: the vessel came within a ship’s length of running aground, and the accident “had the potential to develop into one of the worst disasters at sea in modern times.”

Carnival Triumph, 2013: the famous accident, and the one that actually killed someone

Everybody remembers the first half of this story. On 10 February 2013 a fire in the aft engine room of Carnival Triumph left the ship without power or propulsion in the Gulf of Mexico. It became the “poop cruise” — days of failed sanitation, corridors in darkness, passengers sleeping on deck. The ship was towed in, arriving at Mobile on the evening of 14 February, and the passengers disembarked.

Almost nobody remembers the second half, and it is the one with a body count.

The ship was moved to the BAE Systems shipyard on the Mobile River for repairs. On 3 April 2013, while moored there, a storm front brought high winds through the Port of Mobile — the National Weather Service had issued a Special Weather Statement 37 minutes earlier warning of gusts up to 50 mph. Carnival Triumph broke free, drifted across the river and struck the moored dredge Wheeler. A towing vessel, Noon Wednesday, was pinned between the two.

According to the National Transportation Safety Board’s marine accident brief (NTSB/MAB-14/02, accident number DCA-13-LM-015), one shipyard employee was killed and another injured, and total damage exceeded $2.9 million — $2.7 million to the Triumph alone.

The probable cause is one sentence, and it is worth reading twice:

“The National Transportation Safety Board determines that the probable cause of the breakaway of the Carnival Triumph from its moorings and the subsequent collision with the dredge Wheeler and the towing vessel Noon Wednesday was the successive failure of multiple mooring bollards, which were known by BAE Systems to be in poor condition with an undetermined mooring load capability.”

Known to be in poor condition. Not a freak gust — the ship was held by twenty mooring lines individually rated at 93 tons breaking strength, tied to bollards nobody could put a number on.

The pattern the listicles miss

Put the two findings side by side and the same shape appears.

	Viking Sky, 2019	Carnival Triumph, 2013
What it looked like	A storm nearly wrecked a cruise ship	Freak winds tore a ship from its moorings
What the report found	Lube oil levels too low for a rolling ship; tank design non-compliant with SOLAS	Successive bollard failures; bollards known to be in poor condition
Known beforehand?	Sailed without required generator redundancy	Poor condition known to the shipyard
Investigating body	Norwegian Safety Investigation Authority	US National Transportation Safety Board
Casualties	None; came within a ship’s length of grounding	1 dead, 1 injured — both shipyard workers

Neither accident was caused by the sea doing something unprecedented. Both were caused by a known, dull, documented shortfall meeting ordinary bad weather. That is what accident investigation almost always finds, and it is precisely the part that gets stripped out when a story is retold as a list of shocking moments.

What this means if you are the passenger

• Blackouts are the failure mode that matters. Both the Viking Sky near-grounding and the Triumph‘s Gulf of Mexico ordeal began with a loss of power, not with a collision or a wave. A modern cruise ship is a power station that happens to float.
• Attend the muster drill properly. The Viking Sky evacuation was conducted by helicopter, one person at a time, in a gale. Nobody plans for that; the people who cope best are the ones who already know where to go.
• Official reports exist, and they are readable. If a cruise incident interests you, search for the flag state’s or the national safety board’s report rather than the coverage. The NSIA and NTSB publish in plain English.
• Weather is rarely the whole story. If your sailing is disrupted by a storm, the question of what you are owed turns on contract terms rather than on how bad the weather was — see what happens when a cruise is cancelled for a hurricane and how the fleet handled Hurricane Melissa.

Quick Answers

What caused the Viking Sky incident?

Insufficient lubricating oil in the operating diesel generators’ sump tanks, combined with pitching and rolling in rough seas, caused a loss of oil pressure and a blackout. The Norwegian Safety Investigation Authority also found the sump tank design did not comply with SOLAS requirements for safe operation under dynamic inclination.

How close did Viking Sky come to running aground?

Within a ship’s length, according to the NSIA, with 1,374 people on board. The report says the accident had the potential to become one of the worst disasters at sea in modern times.

Did anyone die in the Carnival Triumph accidents?

Not in the February 2013 engine room fire. One BAE Systems shipyard employee was killed and another injured on 3 April 2013, when the ship broke free of its moorings during repairs in Mobile and collided with a dredge.

Who investigates cruise ship accidents?

Usually the flag state’s accident investigation body, sometimes alongside the country where the accident happened. The Norwegian Safety Investigation Authority handled Viking Sky; the US National Transportation Safety Board published the Carnival Triumph breakaway brief. Their reports are public.

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Sources: the Norwegian Safety Investigation Authority’s report on the loss of propulsion and near grounding of Viking Sky (Marine report 2024/05, published 19 March 2024), and the NTSB Marine Accident Brief NTSB/MAB-14/02 on the Carnival Triumph breakaway. Correction and rewrite: an earlier version of this article listed ten cruise disasters without naming ships, dates or sources. It has been replaced with incidents for which an official investigation report exists and is quoted here. Cruise Chaos earns nothing from cruise lines or shipyards. If we have something wrong, tell us and we will correct it.