Bert Marsh said. Officials say they are apparently buried beneath silt or crash debris. The robot Magnum is larger and better protected against the high seas that forced the USS Grapple with its robot, Deep Drone, to return to port Sunday. The civilian ship that carries the Magnum, the Carolyn Chouest, is also better able to handle the seas. It can essentially hover over a spot without anchoring.
Investigators say they have identified two wreckage fields on the sea floor.