Of the world's coastal seas, the Baltic Sea is warming the fastest. A 2024 study said sea surface and sea floor temperatures have increased by 1.8 and 1.3 degrees Celsius respectively in the ...

The Baltic Sea — Russia’s maritime point of access to the city of St. Petersburg and its Kaliningrad enclave — is now almost surrounded by members of the military alliance.

NATO is deploying eyes in the sky and on the Baltic Sea to protect cables and pipelines that stitch together the nine countries with shores on Baltic waters.

Descending up to 40 meters beneath the Baltic Sea, the world’s longest immersed tunnel will link Denmark and Germany, slashing journey times between the two countries when it opens in 2029.