BIG & Smaller
In answer to the conjectures of Swginn & Codprawn, the boxes up towards the bow have a far more mundane purpose than they suggest.
In the unlikely event of a forced ditching of a helicopter used for crew transfer duties between the mainland & offshore platforms in the North Sea, the ARRCs ( Autonomous Rescue & Recovery Craft ) are capable of rescuing & give primary medical treatment to the full complement of 21 persons. If the accident is so severe that some unfortunates do not survive, the convention is that you stow them with dignity, away from the other survivors. Hence "Non Survivor" boxes.