a modular buoyant support apparatus is comprised of buoyant support modules of inflatable pontoons . the pontoons comprise inflatable cylindrical tubular chambers , typically fabricated of polymer coated fabric sheet material . pontoons are fashioned so that they may be connected directly , in a modular fashion , to the underside of an appropriately configured dock platform . in some embodiments , a pontoon presents a relatively planar surface to the underside of the dock platform . the pontoons connect with attachment mechanisms depending from the dock platform via attachment points integral to or connected to the pontoons . advantageously , the pontoons may be shipped deflated to the location for the dock and , in situ , both inflated for deployment and deflated for maintenance or relocation .