MARTIN PBM MARINER PATROL BOMBER ON A BARGE CONSTRUCTED FROM FIVE BY SEVEN FOOT STEEL BOXES USED BY US NAVY CONSTRUCTION BATTALIONS (SEABEES) FOR BUILDING CAUSEWAYS AND SUPPLY BARGES. THIS BARGE WAS CONSTRUCTED BY THE US 70TH CONSTRUCTION BATTALION. IN THE BACKGROUND TEN OTHER MARINER FLYING BOATS REST ON THE WATER. TWO BARNEGAT CLASS SMALL SEAPLANE TENDERS, WHICH SUPPORT THE AIRCRAFT, ARE MOORED AT THE TOP LEFT.