I am seeing weird things in the sky

I think there is a top secret thing going on at lockheed property in the mountains. I was driving up eagle rock on a utv and i see this triangular object with rounded edges. It was in one spot, then jogged to another and hovered there about a minute at a time. It rapidly flew over and descended behind a mountain range owned by lockheed martin. I panicked and ran behind a burned out rock cliff/cave, when i realized where I was it was darker outside although it was beginning of sunset when i observed it. I knew I was there the whole time, but it seemed like sunset happened in five minutes while I was waiting for it to leave. could not turn on utv until it left. It was jogging across the canyon almost like it was surveying spots.