Before JAMSTEC came up with their SHINKAI 2000 and SHINKAI 6500 submersible there was the UH-06 SHINKAI - Japan's granddaddy of research subs.
The HU06 Shinkai is an unmanned research vehicle built in 1968 and operated by Japan's Maritime Safety Agency, it has a dive depth of 600 meters.
HU06 Shinkai Papercraft (Submersible) [Download]
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