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The coast guard dispatched several vessels to assist, including semirigid inflatable boats and a tugboat, and found several people who were unconscious and in critical condition aboard.

Use semirigid or rigid metal ducting, which is smoother inside and less likely to catch lint.

That means a semirigid sole, a spacious toe box and a small heel lift.

Although the blimp’s replacement, Wingfoot Two, will look about the same when it arrives at Goodyear’s airship base in Carson later this year, it will be a semirigid dirigible.

In Germany, Cargolifter A.G. got as far as building the world’s largest freestanding building, more than a thousand feet long, in which the company planned to construct a helium-filled semirigid cargo hauler.