Shooting In The Dark

This photo is by no means a great photo. It has its problems. I'm posting it here though because when you consider the conditions that it was taken, it is pretty impressive. It was dark. How dark? I was standing maybe 120 feet away, and while I could see the outline of the boat, I could not see the couple or anyone else on the boat. Those two big lights in the back were not all that bright. Between the darkness, distance and engine noise, the couple could not hear me or see me. To me it is pretty amazing that in near pitch darkness an image like this could be captured. Exposure details:  iso of 6400, f-stop of 2.8, 1/15 shutter speed hand held.