Hellegat

You have reached Hellegat, a spot in New York's East River once feared by mariners. You will wait, like sailors past, for slack water. And when the water calms, it will reward you with an image from the depths, surfacing and then sinking back forever.

While you wait for the next slack, you can observe the river's rise and fall, and a map of the tide reaching Hellegat from two directions. You can learn more about the project here.