Didn't they have an existing 3d model for Zeus. Plus while everyone was watching Heron and Blackwood, I thought they had another 250 km's of 2d or 3d work done a coupla months back. Correct me if I am wrong.
If my recollection is right, who says that details haven't arrived back and they are acting on this quickly with the Songa Venus for a reason....
Could be a big reason for this unforecast drill !!!!