They look strange, out of place — and they are. Because they’re not from around here. The odd-shaped stones and boulders that pepper the flat, dark, silty bottom here at nearly 1,800 feet look like meteorites, each surrounded by a wide, shallow crater. They’re not from outer space, but many have traveled a vast distance on Earth — hundreds, perhaps thousands of miles, over millennia. And now my sub is face to face with one of three I’d encounter on our first dive in Zhemchug Canyon yesterday (Saturday) afternoon.