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It’s a concept and design that was first used in World war II. Metal boxes bolted together to form any shape of floating mat,causeway or pier needed. Only two kinds of boxes needed rectangular ones and rectangular ones with an angle cut cut in them to use a ramps or in WWII case the bow of a barge pushed by at the time the largest outboard motor ever made. The granddaddy of this system was used at D day France for which they were designed for. The US went so far as to make floating runways with them to test if they could be used as expedient alternative to escort carriers. For prop planes the and We was a definitive yes thousand plus foot runways with taxiways and parking was floated with planes of the era easily landing and taking off from the floating aerodrome. Got to love American ingenuity unfortunately that would be a stretch as the original original concept was from the Brits America just used it’s industrial might at the time to mass produce it.