I've done some snorkeling on coral reefs in the Bahamas, and it's crazy how far you can hear boats. Once you learn what sound they make (it's completely differe

I've done some snorkeling on coral reefs in the Bahamas, and it's crazy how far you can hear boats. Once you learn what sound they make (it's completely different underwater), you can hear one very clearly but when you pop your head up it's way off in the distance. And this is just for smaller, outboard-powered boats. I've never really had the chance to hear a big ship underwater, but my home is right by the St-Lawrence seaway (the one they talk about in the article) and when it's quiet at night I can feel the rumble they make through the ground when one passes in front of the house.