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Claim 1

A BUOYANT STRUCTURE COMPRISING AN UPPER PART OF BUOYANT CHARACTER PRESENTING AN UPPER LOAD BEARING SURFACE, AND A SUBSTANTIALLY RIGID WALLED VESSEL SECURED TO SAID UPPER PART IN POSITION BENEATH THE SAME AND HAVING AN OPEN TOP PRESENTED TO THE BOTTOM OF SAID UPPER PART OVER SUBSTANTIALLY ITS ENTIRE AREA, THE WALLS OF SAID VESSEL HAVING PERMANENTLY OPEN AND RELATIVELY RESTRICTED WATER INLET PORTS AND AIR VENT OPENINGS PERMITTING COMPLETE FILLING OF SAID VESSEL WITH WATER TO STABILIZE SAID STRUCTURE AGAINST GENERALLY HORIZONTAL AND VERTICAL MOVEMENTS AND TO PROVIDE DISTRIBUTED SUPPORT OF SAID UPPER BUOYANT PART ON THE WATER OVER SUBSTANTIALLY THE ENTIRE BOTTOM AREA OF SAID UPPER PART WHEN SAID STRUCTURE IS POSITIONED FOR USE IN WATER AND PERMITTING COMPLETE DRAINAGE OF THE WATER FROM SAID VESSEL WHEN THE STRUCTURE IS WITHDRAWN FROM THE WATER, WHEREIN THE UPPER BUOYANT PART COMPRISES A SHELL OF REINFORCED PLASTIC MATERIAL CONTAINING INTERNALLY THEREOF A FOAMED MATERIAL SUPPORTING THE UPPER LOAD BEARING SURFACE AND IMPARTING RIGIDITY TO THE STRUCTURE.