Floating marine structure

Claim 1

A FLOATABLE STRUCTURE COMPRISING AN UPPER NON-FLOATING RIGID LAYER, A PLURALITY OF SIDE WALLS SECURED TO AND DEPENDING FROM SAID LAYER ARRANGED TO DEFINE HORIZONTALLY SIDE BY SIDE AIR CELLS, SAID SIDE WALLS TERMINATING IN FREE LOWER EDGES FOR IMMERSISON DOWNWARDLY IN A BODY OF WATER TO TRAP AIR IN THE CELLS FOR SUPPORTING THE LAYER, AN IMPERFORATE HOLLOW AIR SUPPLY PIPE FOR CONVEYING AIR UNDER PRESSURE INTO EACH OF A PLURALITY OF CELLS AND BEING PROVIDED WITH AN AIR INTAKE OPEN UPPER TERMINAL END OPENING OUT FROM THE EXTERIOR OF THE UPPER LAYER FOR CONNECTION TO AN AIR PRESSURE SUPPLY, EACH PIPE EXTENDING DOWNWARDLY THROUGH THE LAYER AND TERMINATING IN A LOWER AIR OUTLET OPEN END IN THE LOWER PORTION OF ITS RESPECTIVE CELL IN CLOSE PROXIMITY TO A PLANE THROUGH THE FREE EDGES OF THE SIDE WALLS, EACH PIPE BEING LONG ENOUGH TO IMMERSE IN THE WATER WHEN THE LOWER EDGES OF SAID WALLS ARE IMMERSE THEREIN AND TO FEED THE AIR OF SAID EACH PIPE INTO THE TRAPPED AIR IN THE CELL FOR ADJUSTING THE BUOYANT SUPPORT OF THE UPPER LAYER, AN AIR OUTLET PIPE EXTENDING FROM EXTERIORLY OF THE UPPER LAYER AND OPENING INTO THE UPPER PORTION OF SAID EACH CELL NEAR SAID LAYER, AND A CONTRL VALVE IN EACH OF SAID OUTLET PIPES OPERABLE TO RELEASE TRAPPED AIR FROM THE RESPECTIVE CELL OF SAID EACH OUTLET PIPE.