Thirty men were enough to make the ship look dangerous.
They were not sailors fighting a storm. They were running from one side of Vasa’s upper deck to the other while the new warship sat tied up beneath the royal palace in Stockholm. Captain Söfring Hansson had arranged the demonstration because he was worried about how easily the ship rolled. Vice Admiral Klas Fleming came down to watch.
The surviving account, preserved through the inquiry held after the sinking, says the men had made only a few traverses when Vasa began heeling badly enough that the test was stopped. There was fear she might capsize at the quay. Museum summaries sometimes render the number as three runs; the underlying inquiry account is slightly less tidy and says only that the demonstration ended after a few trips1.
There was no numerical pass/fail threshold attached to the test. No nineteenth-century naval architecture hiding in seventeenth-century Stockholm. The mathematics later used to calculate stability were still generations away, and shipwrights worked principally from proportions, experience, precedent and experiment.
But the test had produced a physical result. Thirty moving bodies could make one of the Swedish king’s largest new warships roll frighteningly at the dock.
Why Vasa was unstable
Vasa had been commissioned by Gustav II Adolf as Sweden expanded its military power around the Baltic. She was about 69 meters long and rose more than 50 meters from keel to the top of the mainmast. When she departed, she displaced roughly 1,200 to 1,250 tonnes, carried around 120 tonnes of stone ballast and had 64 cannon aboard. Forty-eight were bronze 24-pounders.
The guns matter because Vasa was not simply an ornate royal yacht that happened to be unstable. She was intended to put a remarkable amount of artillery onto the Baltic.
The museum calculates that a full broadside from her main armament could throw roughly 250 kilograms of shot. For a brief moment in August 1628, she was among the most heavily armed warships in northern Europe.
And she looked the part. Her stern rose in tiers of carved figures. Lions, warriors, kings, Roman emperors and biblical characters crowded the upperworks. The decoration was political architecture in wood, built to advertise monarchy and military reach before the first shot was fired.
The museum’s current engineering explanation is straightforward: too much of the ship’s mass and structure sat high relative to the amount of hull beneath the waterline. Vasa was tall, heavily built above, comparatively narrow below and possessed very little initial resistance to heeling. Sailors of the period called such a vessel tender or crank.
The ballast was already there
Jöran Matsson, responsible for stowing the ballast, testified that Vasa carried about 120 tonnes of stone and had been ballasted as deeply as he believed appropriate. The later inquiry did not identify loose cannon or missing ballast as the primary explanation for the sinking. Its attention moved instead toward the proportions and design of the hull itself2.
Ballast still affected stability, but the museum’s modern discussion points to larger design changes: armament, hull form near the waterline, or upper structure.
The inquiry’s shipwrights found a wonderfully physical way to describe the problem. The ship did not have enough “belly” to carry what had been built above it.
Who knew?
This is where the story gets less comfortable.
The stability demonstration probably took place around July 8 or 9, roughly a month before the maiden voyage. Captain Hansson had brought Fleming aboard specifically because of concern about the ship’s steadiness. Thirty men ran. The rolling became alarming. Fleming stopped the exercise. Jöran Matsson later testified that he heard the vice admiral make a remark to the effect that he wished the king were home.
Gustav Adolf was not home. He was abroad with Sweden’s army during the war with Poland-Lithuania and had been pressing for the long-delayed ship to become operational. The museum’s account says Fleming did not report the troubling demonstration to him.
That does not mean the king personally stood on the quay, watched the stability test fail, and ordered Vasa to sea anyway. He did not.
Sunday afternoon
August 10, 1628, was a Sunday.
The crew had attended church. Families and guests, including women and children, were aboard for the first portion of the voyage and were supposed to leave at Vaxholm before Vasa continued toward the fleet base at Älvsnabben. The soldiers intended for wartime service had not yet embarked. Estimates for the number aboard at the sinking vary, generally around 150 to 200.
The lower gunports were open and the cannon run out. A salute was fired as the ship moved into the harbor.
At first there was barely enough wind to fill the sails. A small gust heeled Vasa to port. She recovered slowly.
Then, as the ship reached more exposed water near Tegelviken, another gust pushed her farther over. Water reached the lower gunports and began pouring into the ship.
The captain ordered the sheets released to spill wind from the sails and ordered the gunports closed. Vice Admiral Erik Jönsson went below to see whether the cannon had broken loose.
They had not.
That detail matters because one of the first explanations people reached for after the disaster was shifting artillery. The guns were still secured.
The ship itself was moving.
A staircase becomes a problem
Once water began entering the lower gundeck, Vasa did not give the people inside much time.
Those on deck could jump into the harbor. Boats crowded around the maiden voyage immediately began pulling people from the water. Some survivors swam roughly 120 meters to Beckholmen. Others clung to parts of the rigging that remained above water after the hull reached the bottom at about 32 meters depth.
People below decks had a different problem. The ship was heeling, ladders were becoming difficult to use, water was entering rapidly and the exits were above them.
Modern archaeological and DNA work has identified remains from at least seventeen individuals. Contemporary written estimates of the dead vary. Three surviving letters give figures around 30, 40 and 50, while the museum generally uses “roughly thirty” in its current interpretation. Only one victim is securely named in surviving written sources.
That uncertainty should stay. There had not even been time to complete a proper muster before Vasa departed.
Four hundred years later, the archaeology knows some of the dead better than the paperwork does.
Then everyone had to explain themselves
The Council of State began asking questions almost immediately.
Captain Hansson was interrogated before his clothes were fully dry. He insisted that his crew had been sober, that the guns had been properly secured and that the ship had simply been too unstable. King Gustav Adolf, informed in Prussia, demanded an inquiry and punishment for whoever was responsible.
The formal inquest opened in September.
Its surviving record is fascinating because responsibility moves around the room without ever settling. Officers initially denied knowing the ship was dangerously unsteady. Then Matsson described the thirty-man test.
Builders were questioned. The original master shipwright, Henrik Hybertsson, had already died. His successor, Hein Jacobsson, said the vessel had been built according to Hybertsson’s design, which the king had approved. He also acknowledged that he had widened the ship slightly during construction, suggesting that the dimensions had concerned him.
The inquiry eventually arrived at a place familiar to anyone who has ever watched a complicated failure get divided among organizations.
The design was wrong. The builder was dead. The king had approved the broad dimensions. The admiral who had watched the stability test was not interrogated.
No one was punished.
That ending sounds cynical if we make it too neat. The same inquiry also correctly understood the physics involved, despite lacking modern naval architecture. Its experienced sailors and shipwrights recognized that the ship carried too much high structure for the supporting hull below.
They understood the failure better after it happened than the organization had been able to act on it before.
Vasa was not really lost
After sinking, Vasa became a navigation hazard in Stockholm harbor.
Most of her valuable bronze cannon were recovered by divers in the seventeenth century using diving bells. The ship then receded from everyday attention, but the familiar description that Vasa was “lost for 333 years” is not quite right either.
The Vasa Museum itself now makes that correction.
The wreck appeared on older charts. Divers had visited it in the nineteenth century. The navy used the area for diving training, and salvage interests periodically discussed the wreck. Anders Franzén did not discover a ship whose existence had vanished completely from human memory.
What Franzén did was more consequential. He treated the wreck as something worth raising intact.
In August 1956, his homemade coring tool brought up black waterlogged oak from the harbor bottom. Divers confirmed that an extraordinarily intact two-gundeck ship stood in the mud. Franzén then persuaded naval, salvage, archaeological and institutional partners to attempt something considerably more difficult than proving Vasa was there.
Bring her back.
Six tunnels beneath a ship
Divers spent years preparing the wreck.
They used high-pressure water jets to excavate six tunnels beneath the hull. Steel cables were pulled through those tunnels and attached to lifting pontoons. Vasa was raised gradually in eighteen stages, shifted into shallower water, strengthened, patched and prepared for the final lift.
At 9:03 on April 24, 1961, the ship broke the surface.
Television carried the event across Europe. The ship that had been defeated by a few minutes of sailing now required years of engineering to move a few dozen meters vertically.
Excavation recovered tens of thousands of objects: tools, clothing, food remains, sailors’ chests, gun carriages, cannonballs and human remains. The Baltic’s low salinity and low-oxygen conditions had protected the oak from shipworm, helping preserve roughly 98 percent of the original ship structure.
That preservation is why we can now argue about a stability test performed in 1628 while standing beside the ship that failed it.
The test is happening again, differently
Vasa is still moving.
The ship has rested in essentially the same support system since the 1960s. Conservators eventually found that chemical degradation and weakened wood were allowing parts of the hull to deform. The museum monitors structural movement and, beginning in 2024, started installing an entirely new support system intended to distribute loads more appropriately and reduce continuing distortion. The goal is to finish the work by 2028, Vasa’s four-hundredth anniversary.
The museum says the preserved ship currently leans slightly to port and that the inclination has been increasing.
The new cradles and adjustable supports are being positioned according to years of structural research, monitoring and testing. Installation is planned down to millimeters because the surviving seventeenth-century oak can no longer tolerate casual redistribution of load.
There is an unusually good Final Vestige comparison here to Add No More Load.
At Quebec Bridge in 1907, engineers possessed visible measurements showing steel members deforming before the structure collapsed. With Vasa, there was no strain gauge or mathematical model, but there was still a physical demonstration telling experienced people that the ship moved too much under a very small imposed load.
Different centuries, different instruments. The uncomfortable part is the interval between noticing movement and deciding what it means.
Thirty
The thirty men never sailed Vasa by running across the deck.
They did something more useful.
For a few minutes at the quay, they made the ship answer a question: how steady are you?
The answer did not come in tonnes, degrees or metacentric height. The ship rolled until an admiral became afraid to continue.
A month later, Vasa left the quay. About twenty minutes after that, the harbor performed the same test with wind.
Evidence Notes
- Vasa Museum, The Inquest: the thirty-man running test was stopped after only a few traverses because the ship heeled alarmingly; later summaries often compress this into three runs. ↩︎
- Vasa Museum, The Inquest: ballast master Jöran Matsson testified that Vasa carried about 120 tonnes of stone ballast; the inquiry focused on the ship’s proportions rather than loose cannon or simply missing ballast. ↩︎
Sources & Further Reading
The strongest evidence comes directly from the Vasa Museum, which preserves the ship, the archaeological collection and surviving seventeenth-century inquiry material.
- Vasa Museum, “The Inquest.” The central source for the thirty-man stability demonstration, Klas Fleming’s reaction, the 120 tonnes of ballast, secured cannon and the post-sinking inquiry.
- Vasa Museum, “The Disaster.” Institutional reconstruction of the maiden voyage, open gunports, sequence of gusts, efforts to save the ship and rescue of passengers and crew.
- Vasa Museum, “Battle!” Current museum interpretation of the surviving 24-pound cannon and the warship’s intended combat role.
- Vasa Museum, “Skeletons from Vasa.” Current archaeological and genetic research on the people who died aboard the ship and the limits of the casualty evidence.
- Vasa Museum, “The Salvage.” Institutional account of Franzén, the diving work, the staged lifts and the 1961 recovery.
- Vasa Museum, “Vasa’s New Support.” Current structural research, deformation monitoring and installation of the new support system scheduled for completion around 2028.
- Vasa Museum Press Images. Rights source for the museum press visuals used here; the museum states that this selected material is free for editorial use with credit.