Tanks
I think you could make a tank out of sonotube, either from building supply store, or maybe a left over piece from a local contractor. Pretty lightweight. Tubing from a C-pap machine, mouthpiece from sports mouthguard (or a binky!). You won't be able to sit or maneuver in a crowd with a tank on your back. Maybe the snorkel and the association with other cast members is enough to complete the image?
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