Low-Flying Metallic Sphere Over Hudson Bay Mountain

I heard the sound of something moving fast above my head and looked up to see a squished spherical shaped metallic object flying overhead at what I would call ‘Mach speed’ and quickly disappeared out of sight over the forest beside my home. It didn’t look perfectly metallic, possibly some black on it but that could also have been shadows from the nearby trees. It was very low, only about 20 feet above the trees here, putting it at about 120 feet above the ground. The sound sticks out as the most remarkable- such a fast moving object but no other sound except for the windbreak.