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The Dolphin 3K was developed by the Japanese Marine Science and Technology Agency (JAMSTEC) in 1984 for pre-site surveys, rescue of the manned submersible 'Shinkai 2000', and scientific reconnaissance surveys. The vehicle was constructed at Mitsui Engineering & Shipbuilding and was completed in 1987. The vehicle is operated from the JAMSTEC support vessel Natsushima.

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Q: When was the Dolphin 3K invented?
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