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National Aquarium: A crane lifting in a large I-beam
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National Aquarium: Getting the I-beam to the exhibit
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National Aquarium: Underwater construction
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National Aquarium: Underwater construction
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National Aquarium: Underwater construction
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National Aquarium: Underwater construction
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National Aquarium: Underwater construction
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National Aquarium: Underwater construction
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National Aquarium: Underwater construction