HUGE BLACK TRIANGLE CRAFT WITH 3 LIGHTS IN VIRGINA.April 5th, 2017, around 5:10 AM, I was outside our shop at Newport News shipyard, taking a break and talking with a few coworkers, when I noticed something in the sky right above my head, about 250-350 feet. I had just enough time to be able to point and say, "What is that?" and my other two coworkers were able to catch a glimpse of it before it disappeared behind a building. I ran to the other side of the building, which only took me about 10 seconds to get there, to see if I could see it, and it had disappeared. It was heading northeast just west of Langley Air Force Base.It was a clear night. We didn’t hear any sounds before or after spotting the aircraft. It was a solid black triangle (all sides were the same size, a perfect acute angle) the size of a football field with a light in each corner of the craft. The lights were pulsating very fast almost like an energy surge. The best way to describe the lights would be comparable to halo lights, but soft white in color. The lights seemed to be what powered the craft.None of us could identify it to anything we've seen before like a drone, or military plane. I grew up around the air force base and I've seen a lot of night flight drills, and have never seen anything like this before.