 These anomalous fossils are capable of motion, appearing to swim through sedimentary rock, as though it were shallow water. A large fragment of rock containing several instances of SCP-477 was somehow obtained by the World Museum of Natural History and put on display. It was placed in contact with the museum's sandstone western wall, and one or more organisms escaped and multiplied. By the time Foundation personnel arrived, thousands of the creatures had infested the building, weakening structural integrity, and collapsing an inner wall. The old wing of the museum was dismantled and ground into powder, as part of a renovation project announced by the museum's board of directors.