Complete Novices Try the Navy’s Damage Control Simulator - Sinking Ship Simulator: The Royal Navy's Damage Repair Instructional Unit. At HMS Excellent in Portsmouth sits Hazard, a Royal Navy Damage Repair Instructional Unit (DRIU). Every Navy recruit who's going out to sea will have to go through something like this -- and on a much harder level than we did! But then, they'll have had months of training and teamwork beforehand... | Tom Scott