The photo was taken by a RN official photographer, it was in the days when the Navy carried out actual training exercises. It was a towex, where the tug comes in close under the bow and a messenger line is fired by either vessel, then the towing rig is heaved inboard and the tug then takes the weight. It was hanging in Rollickers officers mess and I purloined it when she was being stripped for sale as no one wanted it. An yes Bob, engineers where either down below or on the bridge to be educated!!!!!!