Why saw something, that we still can’t explain

While fishing. We saw something, that we can’t explain. There was a long, cigar shaped, rather large object with NON flashing lights along the length of it. It produced absolutely no sound and it was very quite on the lake that time of night. It was relatively slow moving(not fast enough to support aircraft flight). NOT Helicopters or any type aircraft that we could associate with this)(or we’d have heard them for sure). To me, it was opaque. Almost to the point you could see through it, but not quite. We don’t know what we saw, but it was NOT explainable to us.