I work offshore in the oilfield in Angola. We were working outside when one of my technicians said he seen some strange lights in the sky. We saw about 8 lights (3 were in a close triangle shape) at different elevations all around a 220-240 heading. All were around the same brightness and were flickering white, red and blue which lasted about 30 minutes then were just gone. We did not see exactly when they disappeared. We were not watching continuously. I did not take any pictures as we would have to get a permit to take pictures and takes a while to get. We are in block 37 off the coast of Luanda Angola.