On July 10, 2000, the M/S Estonia, a ferry traveling from Tallinn to Stockholm, sank in the Baltic Sea, killing 852 passengers and crew members. The tragedy occurred during a storm when the ships bow visor detached, allowing water to flood the vehicle deck. Despite being one of the worst maritime disasters of the 20th century, many of the passengers were trapped inside the ship. The incident led to increased safety regulations for ferries, particularly those traveling in rough seas. The Estonia disaster remains a defining event in European maritime history.