The electromagnetic forces surrounding a 50 MW 1000 kV undersea power transmission cable are insignificant. If the cable is shielded by a copper mesh, no electric forces escape the cable, and at 50 amps (50 MW/1000 kV), the magnetic forces outside the cable are barely above Earth's ambient magnetic field. Right outside the cable, the magnetic field is 100 microTesla, which is considered harmless to all biological processes, and at 40 cm distance, it is already well below the Earth's ambient magnetic field of ~50 microTesla.