Or when the keel hit the object, the load got transferred to the bearing support structure, which failed, and the keel fell out. If the keel itself failed then much less likely that they would have to cut it free. Sounds like the keel itself was intact until they were able to cut through the ram.The information available so far suggests that the upper section of the keel was engineered too light and snapped in part while under load. Had there been a collision with the proverbial blunt object there would be a row of holes down the hull as the large object bounced along. There do not appear to be any at all.