MS Estonia

The Vessel

The MS Estonia was a roll-on/roll-off passenger ferry built in 1980 by Meyer Werft at Papenburg, West Germany, as the Viking Sally for the Finnish operator SF Line on the Turku-Mariehamn-Stockholm route. She was 157 metres long, 15,566 gross tons, certified to carry 2,000 passengers and 460 vehicles, and featured the characteristic bow-visor opening of the 1970s-1980s Baltic ro-ro design.

She was sold through a sequence of operators in the late 1980s, renamed Silja Star in 1990 and Wasa King in 1991, and was acquired in January 1993 by Estline, a joint venture between the Estonian state shipping company and the Swedish Nordström and Thulin group. She was renamed Estonia that autumn in a ceremony in Tallinn attended by the Estonian president Lennart Meri, who described her as "the ship that ties Estonia back to Europe". She took up the Tallinn-Stockholm overnight route, the principal maritime link between the newly-independent Estonian state and Western Europe.

Her bow visor, the upward-lifting cover that closed over her vehicle-deck ramp, was of the Atlantic Hydraulic design common to Finnish-Swedish ferries of the period. The design had been identified in a series of internal technical reports by Finnish classification society Veritas as having potentially inadequate locking provisions under certain wave-impact conditions. None of these reports had been published; the visor design remained approved. She had been built, inspected, and certified to all applicable standards.

The Voyage

She left Tallinn at 19:15 on 27 September 1994 on her normal overnight run to Stockholm, carrying 989 passengers and crew: 803 passengers (from Estonia, Sweden, Finland, Russia, and ten other nations), 186 crew. Her cargo deck held 40 vehicles and three trailers. The Baltic weather forecast for the night was force 7 to 8 south-westerly, rising to force 9 through the middle watch.

She cleared the Gulf of Finland through the evening and entered the northern Baltic proper by midnight. By 00:30 on 28 September she was rolling ten to fifteen degrees in seas running at four metres, within her design envelope but at the upper end of it. The crew on the car deck reported metallic banging from the bow visor area and the sound of water striking the ramp; both were consistent with normal operation in heavy weather. The second officer, Tormi Ainsalu, was on the bridge watch.

At 01:00, approximately 22 nautical miles south-southeast of the Finnish island of Utö, the bow visor locking mechanism failed. The visor tore away from the ship and took the inner bow ramp with it as it fell. Water entered the vehicle deck at a rate measured in hundreds of tons per minute. The list to starboard built within two minutes to the point of no return.

The Disaster

She capsized and sank in under forty minutes. At 01:22 the wireless operator Andres Tammes transmitted a Mayday; at 01:30 contact was lost. The Finnish Helsinki Radio received the Mayday and dispatched the nearest response vessels, the passing ferries Silja Europa, Mariella, and Isabella, each of which diverted to the scene. The Mariella was the first to arrive, at 02:12; by then the Estonia had been gone for 30 minutes.

Of the 989 aboard, 137 survived. 852 died. Most of the dead were asleep in their cabins at the moment of the visor failure; the capsize was so rapid that those who did reach the upper decks had perhaps six to eight minutes between the sounding of the general alarm at 01:24 and the final capsize. Water temperature that night was 10 degrees Celsius at the surface; a human in those conditions without an insulated survival suit will lose capacity for purposeful movement in fifteen minutes. The rescue helicopters from Turku and Helsinki worked a debris field of life rafts and survival suits through the sunrise, pulling people alive from water they had been in for three hours.

The Swedish, Finnish, and Estonian governments established a Joint Accident Investigation Commission (JAIC) within 24 hours. The wreck was located that afternoon at 80 metres, on her starboard side, 22 nautical miles south-southeast of Utö. The visor was found a nautical mile north of the main wreck, confirming the sequence of the failure.

The Legacy

The JAIC final report of December 1997 identified the proximate cause as the failure of the bow visor's locking mechanism under heavy-sea wave impact, and the root cause as a latent design weakness in the Atlantic Hydraulic visor-lock that had not been identified in the 1980 classification survey. The report was accepted by the three governments as the official account.

It was not accepted by the German manufacturer Meyer Werft, by the Finnish classification society, by the surviving families, or by a substantial body of independent investigators. Alternative accounts have included an explosion in the vehicle deck, a collision with an unidentified submerged object, a deliberate scuttling to destroy a cargo of smuggled cobalt, and a Russian naval strike on a ship carrying exfiltrating Soviet weapons technology. Most of these theories have been formally investigated and dismissed; the alternative that the visor failure was triggered by something else below the waterline has not been definitively disproven.

In September 1995, the three governments signed the Estonia Agreement declaring the wreck a grave and prohibiting diving on her except for the recovery of human remains. The Agreement was criticised as politically motivated; it has been revised twice, most recently in 2020 when a Swedish documentary team was permitted to survey the wreck and recorded 40-metre-long damage to her hull below the waterline that the 1997 JAIC report had not described. The Swedish Accident Investigation Authority reopened the case in 2022.

The full story of MS Estonia is not closed. She is the deadliest peacetime European maritime disaster since the Titanic; she is the deadliest post-1945 peacetime European maritime event by a large margin; and her final cause remains contested thirty years after her loss. The 852 dead are named on the Estonia Memorial at Slussen in Stockholm, at the Merchant Sailors' Memorial in Tallinn, and on a single black granite wall outside the Estonian Museum at Valkla. She is the ship whose sinking, uniquely in modern maritime history, will probably never be fully explained.