from Wisconsin Wildlife Ethic
These sonic cannons are compressed airguns that get towed behind ships, using dynamite-like blasts to produce sound waves 100,000 times louder than a jet engine underwater every ten seconds. The waves travel through the water and through the ocean floor, bouncing back up at different rates to provide prospective drillers and researchers a better sense of where oil, gas, minerals, and sand lie beneath the waves.
It’s not a surprise that this is dangerous: even BOEM estimates that this practice will disrupt, injure, or kill millions of marine animals including the most endangered whale species on the planet. It is less surprising that this risky tactic would be approved in large part to ferret out another source of fossil fuels, risking another BP disaster and emitting more pollution that causes global warming. It’s more surprising that this gambit is being entertained in an area that may not even have that much oil or gas.”