I think they could look at satellites looking at that region at the time. There are satellites just taking photos and they probably have captured something.
...there really aren't satellites 'just taking photos' of the ocean. You might have a spy satellite taking pictures of a naval exercise. I think you are underestimating a) how vastly big the ocean is, and b) satellite capacity (most intelligence satellites are over land).
71% of the world is ocean. The ocean is vast, and most of it has very little going on. Last month someone washed up having been lost at sea for over a year, having only seen two or three ships (which didn't stop). A few ships in 13 months.
71% of the world is ocean. The ocean is vast, and most of it has very little going on. Last month someone washed up having been lost at sea for over a year, having only seen two or three ships (which didn't stop). A few ships in 13 months.
http://www.cbsnews.com/news/jose-salvador-alvarenga-healthy-...