Abstract: A dock module comprises an air-tight flotation chamber with a buoyant foam material positioned within an upper end thereof. The flotation chamber includes aperture positioned on its bottom end to permit water to enter the chamber and serve as a ballast. To float the dock module, compressed air is injected into the flotation chamber to increase the module's buoyancy and adjust its freeboard so that the buoyant foam is lifted completely above the water contained within the flotation chamber. If the air-tight flotation chamber fails, the buoyant foam will prevent the dock module from becoming submerged. Each module comprises a plurality of longitudinally and laterally extending tubes that can be used to attach the module to a like module using tubular couplers and tensioned cabling. Multiple modules can thus be joined in any desired configuration to yield a floating dock system having virtually any desired geometry.