Looks kinda like one of those big pontoon thingy's that are attached to the bottom of multi-hull boats to keep the hulls out of the water if the boat
is going to sit for a while. Saves on the costs of scraping the hulls every 12 months or so. But I doubt this would be what it is because of the
gasses it contained.
My "not so serious" suggestion would be its a giant sushi roller.
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