Many/Most large shipping vessels now employ “active” Impressed Current Cathodic Protection Systems (ICCP) that power up to 1500 amps of electrical current into the seawater around the vessels.
Electrical current does not just seek path of least resistance it seeks all paths and sets up an electric field which will vary depending upon distance, salinity, pH, temperature, etc. from anodes.
Divers require lockout/tagout(shutoff) for this system before swimming in electrified zone. Who notified the dolphins and whales?
Whales/dolphins are dying/stranding near shipping lanes, oil platforms and underground piping regions that all use high current density cathodic protection systems (up to 1500 amps flowing into the conductive seawater around each vessel/structure).
Whales are also stranding near the oil platforms and shipping in the North Sea. Those look like Lichtenberg marks on the skin of the whale, which are signs of electrical shock.
Since the 1990s, a total of 82 sperm wales have been found stranded in the Wadden Sea in Denmark, the Netherlands and Germany. The sperm whale is the largest of the toothed whales, and the largest toothed predator.It can measure up to 20 metres (67 feet) long and weigh over 50 tonnes.