It's been ten years since the car/passenger ferry M/S Estonia sank at the stormy Baltic Sea, taking with it the lives of 852 passengers and crew. Most of them were either swedes or estonians. Only 137 survived in total and only 95 bodies were ever recovered from the sea.
I don't know how well the disaster is known outside the Baltic Nations and Europe, but to us it means a lot. It was the largest peace-time sea disaster ever on the Baltic and still remains a hot topic.
The official explanation of the sinking was the failure of the bow door locks. The entire bow visor tore off in the rough weather (wind 25-30m/s, waves at 6-12m). The water quickly flooded the car deck and the ship begun to lurch. In only 30 minutes the ship turned entirely over and sank, leaving the survivors to the freezing water. M/S Mariella arrived shortly after and helped the rescue helicopters to locate and recover the survivors.
The bow visor was later lifted from the sea for investigations. The ship itself was left to the ocean, with Sweden, Estonia and Finland declaring sanctity over the site. This however has not prevented conspiracy theorists from violating the tomb of the victims in the search of evidence for the claimed bomb aboard the ship.
