Danish authorities said the leak occurred in the exclusive economic zone southeast of Bornholm island. Danish Maritime Authority announced all vessels must avoid the area:

Mariners are advised not to navigate within a five nautical miles area of the mentioned position.” 

The Russian-owned pipeline, which was intended to double the volume of gas flowing from St. Petersburg under the Baltic Sea to Germany, had just been completed and was filled with 300 million cubic metres of gas when German Chancellor Olaf Scholz cancelled it shortly before Russia invaded Ukraine.

https://www.zerohedge.com/commodities/defunct-nord-stream-2-pressure-mysteriously-plunges