Huge UFO over Ocean in NASA photo

On November 2013, ufologist “Streetcap1” has discovered, on NASA website, a huge and black disc-shaped UFO hovering above our Earth. What is it?

Scott C. Waring explains:

This UFO was discovered back in Nov 2013, but I have not seen this one before. This shows a massive stealth black disk over the ocean. The dimensions are almost perfect. Streetcap1 of Youtube found this one and I have to say its beyond words. This UFO looks to be more than 5-7 miles across. Since it is over the ocean area, the only place that it could hide without being noticed is below the ocean. Any space craft with advanced tech should have no trouble under water. Fantastic catch. SCW