Black Triangle Sighting in Miami, Florida on April 10th 2015 – I was on a cruise ship was looking at a Dolphins In the water there was a triangle object silently traveling under the cruise ships out towards the ocean

On a vacation was out on the balcony looking at the other ships then I saw a dolphin swimming in the waterway. I was watching a huge ship come in and underneath it was a black shadow triangle/ boomerang silent just going out the water way. We were in the port of Miami. It was huge like the size off a b2 bomber. It really freaked me out there was coastguard and all ships and people and it was huge silent and black. I only saw it cause i was 5 stories up on a balcony