Coast guards rescued three divers off the northern coast of Poland over the weekend whose dubious explanation of their night-time dive near critical energy infrastructure, along with their mysterious identities, has reportedly sparked a cross-agency investigation.The Maritime Search and Rescue Service SAR told CBS News the rescue operation involved police officers, firefighters, and medical workers.Cezary Przepiorka, deputy captain of the Port of Gdansk, told Polish media that only one of the men had formal identification, and the phone numbers offered by the divers were either incorrect or non-functional.A thorough investigation can be expected, especially so soon after the sabotage attack on the undersea Nordstream 1 gas pipeline just weeks ago.Poland's port of Gdansk, which is vital to the country's energy supplies, sits only about 20 miles from Russia's far-flung, equally strategic western territory of Kaliningrad."