Pontoon:
"A watertight float or vessel used where buoyancy is required in water, as in supporting a bridge, in salvage work, or where a temporary or mobile structure is required in military operations."
Queer thing to be playing with in a drawing office …. 
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"I say we take off, nuke the site from orbit. It's the only way to be sure."
Corporal Hicks
(Actually Ripley said it first.)
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