Hopefully what everyone will walk away with is an experience of what it really does sound like down there. They'll have some sense for the fact that the human activity is now adding to that sound and it's having an effect.

In some cases it's not exactly known how animals make these sounds, and what they use them for. It's speculative.

It sounds like a subway train.

The natural sounds that exist -- ice and rainstorms and earthquakes. And also the sounds of human activity -- the noise of ships of all kinds.