1617 Sweden and Russia sign the Treaty of Stolbovo, ending the Ingrian War and shutting Russia out of the Baltic Sea.
1945 World War II: The ''Wilhelm Gustloff'', overfilled with refugees, sinks in the Baltic Sea after being torpedoed by a Soviet submarine, leading to the deadliest known maritime disaster, killing approximately 9,000 people.
1994 The car ferry {{MS|Estonia}} sinks in Baltic Sea, killing 852 people.
2004 A Swedish DC-3 shot down by a Russian MiG-15 in 1952 over the Baltic Sea is finally recovered after years of work. The remains of the three crewmen are left in place, pending further investigations.