Help! Last year when we were cruising round-trip out of Seattle, we were up late and out on the balcony multiple nights. During the night, we could see birds diving into the ocean. It was so dark that we could not see the birds well, mostly flash of movement, and they did not seem to just be swooping down but actually diving since they disappeared from view at water level. It was very strange and we watched them for quite a while. We did not hear any bird sounds. We assumed that the birds were using the lights from the cruise ship which might lure fish closer to the surface? Can anyone help us identify which birds might be out hunting very late/early morning?