PORT CHARLOTTE, Fla. The fastest ocean liner ever built went to the bottom of the Gulf on Veterans Day, and she took one of the Cold War’s best-kept engineering secrets with her. The SS United States was paid for in part by the U.S. Navy so she could carry 14,000 troops to Europe on short notice, and for years her true top speed was treated as military information. Even now, the numbers don’t agree.
The SS United States top speed has been quoted anywhere from 35 to 45 knots, depending on who you ask. We lined up every figure we could source, the one measured on a trial run, the record crossing, the rumor and the claim from her own preservation group, and only one of them was ever recorded under test. That gap is what Florida divers will be swimming over now that the ship sits off Destin.
Sunk on Veterans Day, landed upright off Destin
Okaloosa County had planned to sink the ship on Nov. 12. Forecasts of heavy wind pushed the deployment up a day to Nov. 11, with operations starting at 2 p.m., WWSB reported. County Board Chairman Trey Goodwin said safety came first and that the new date gave the moment special meaning, since it honors veterans and the country the ship was named for.
Crews flooded her Wednesday night. On Thursday afternoon, county officials confirmed she landed upright, and the reef is now open to divers, according to FOX 13 Seattle, which listed the wreck at 30° 07.148′ N, 86° 46.755′ W. Early guided tours are running about $300 a person.
The depth depends on which report you read. FOX 13 put the seafloor at 180 feet with the top decks at 60 feet. In October, Stars and Stripes reported a planned resting depth of about 160 feet with the superstructure about 75 feet down, roughly 22 nautical miles southwest of Destin-Fort Walton Beach. The money figures differ too: Stars and Stripes said the county had spent $10.1 million getting her ready, while a Fox News report put the project’s value at $13.5 million. WWSB said the work was paid for with tourism revenue and partner contributions.
A liner the Navy paid to make fast
She looked like a luxury liner, and she was one. Four presidents sailed on her, from Truman to Clinton, according to the SS United States Conservancy. But the Pentagon was in the room from the first drawing.
In the early 1950s, military planners wanted a way to move a lot of soldiers across the Atlantic fast if the Soviets rolled into Western Europe. Stars and Stripes reported that the Navy paid about a third of the $77.7 million construction bill, and in exchange the ship was built to military preferences:
- Extra compartments in the hull so she could survive a torpedo hit.
- A fuel range longer than a civilian ship needed. The Conservancy says she could carry 14,000 troops 10,000 miles without refueling.
- A hull narrow enough to fit through the Panama Canal.
- Heavy use of aluminum to keep her light. The Conservancy says she used more aluminum than any construction project before her.
She was never called up. According to Stars and Stripes, she made more than 400 round trips before she was pulled from service in 1969, beaten by jet travel rather than by any enemy. The idea of a troopship that could outrun a submarine is the same Cold War thinking behind the Navy files we dug into for the SS Cornwallis and the Nazi spy sub off Maine, only this time the ship was built to never get caught.
The SS United States top speed nobody would confirm
Here is what’s on the record. On her maiden voyage in July 1952, she crossed eastbound from the Ambrose lightship off New York to Bishop Rock off England in 3 days, 10 hours and 40 minutes, averaging 35.59 knots. That broke the Queen Mary’s record by more than 10 hours and won the Blue Riband. The Conservancy says she was the first American ship to take it in 100 years, and it says she still holds the record.
The Conservancy also lists a speed-trial figure of 38.32 knots, about 44 miles per hour, reached on a full-power run in June 1952. That is the only top-speed number that came out of an actual test.
Everything above that is where the mystery lives. A figure of 43 knots leaked after her trials and has never been verified. The New York Times reported in 1968, after her military details were unclassified, that she could make 42 knots. And the Conservancy, as cited by Stars and Stripes, points to declassified Defense Department records showing a top speed of 45 knots.
Why would anyone hide a passenger ship’s speed? Because a troopship’s best speed is exactly what an enemy submarine commander would want to know. If you know how fast a target can run, you know where to wait for it. Accounts of her design say her propellers were a closely held secret too. Like the green fireballs over Los Alamos, this is a story where government secrecy did a lot of the work of building the legend.
Built with no wood, in a dock hidden from view
Her designer, William Francis Gibbs, was obsessed with fire. The Conservancy says he banned wood from the ship’s construction and fittings, with one exception: fire-resistant mahogany in the grand pianos. To prove the point, a Steinway was doused with gasoline and lit. It didn’t burn.
She was also built almost entirely in a graving dock, out of public view, and the Conservancy says the details of her construction were kept top secret. A ship the public could buy a ticket on, built where the public couldn’t see, is how you end up with seven decades of bar arguments about how fast she really went.
What Skeptics Say
Naval historians who doubt the big numbers have a solid case. The 43-knot figure started as a leak, and we could not find a published trial log that backs it. The 45-knot figure comes from a preservation group with every reason to celebrate the ship, and we have not seen the underlying records ourselves. A study by the naval architecture firm John J. McMullen and Associates put her highest sustained speed closer to 35 knots.
There’s also a plain engineering explanation for the spread. Speed on a trial run depends on how much fuel, water and cargo a ship is carrying, and trials are often run light. A liner on a schedule never runs flat out, so her record crossing at 35.59 knots says more about her cruising pace than her ceiling. And a top speed that was classified for years is bound to grow in the retelling. The most honest answer is that 38.32 knots is the best-documented number, and anything higher is a claim until the paperwork is public.
What divers will find off Destin
The ship spent 1996 to 2025 tied up on the Delaware River in Philadelphia, rusting while preservation plans came and went, according to the Conservancy. She was towed out in February 2025 to Mobile, Alabama, where crews stripped her for sinking. Fox News reported they pulled more than 400 portholes and cut large holes in her decks so the sea could take her evenly.
She now outranks the USS Oriskany, the Navy aircraft carrier sunk nearby in 2006, as the largest artificial reef in the world, according to Stars and Stripes. That puts two Cold War ships with Navy ties on the same stretch of Gulf floor, a short run from the bases along Florida’s Panhandle. County spokesperson Nick Tomecek said about 500 artificial structures already sit nearby, FOX 13 reported. For people who won’t dive, a museum built around her original smokestacks is planned, though officials told FOX 13 it is several years away. More stories like this one live in our Historical Events and Analysis section, including our look at how Veterans Day became law.
Twenty-plus years in aerospace manufacturing taught me to trust test data over legend. My bet is she was faster than 38 knots and slower than the rumors. What I want now is simple: release every page of the Navy’s design and trial records, and let the museum tell the troopship story straight. The men she was built to carry deserve that more than another rumor.
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Rocci J. Stucci is the founder and CEO of Stucci Media and host of The Rocci Stucci Show.
