Edokko-1 (江戸っ子1号 Edokko Ichigo) is a Japanese small-sized unmanned submersible developed by Edokko-1 Project Committee in 2013. On November 22, 2013, the submersible dived to a depth of 7,800 meters in the Japan Trench and captured images of deep-sea fish using a 3D full hi-vision video camera. The Edokko-1 Project Committee consists of five small- and medium-sized firms based in Tokyo and Chiba prefectures. The submersible was developed jointly by the Committee and a consortium of support organizations (including universities, research labs, private firms and volunteers).
Contents
Development
The concept of Edokko Ichigo originates from Yukio Sugino, the president of Sugino Rubber Chemical, Ltd., who was eager to start a new project in Tokyo to develop a device that can “reach deep-sea,” inspired by the successful launch of the “Maido Ichigo” satellite by East Osaka Craftsmen Astro-Technology SOHLA in Osaka. Although he initially planned to develop a probe that can dive to 11,000 meters, the plan turned out unfeasible. JAMSTEC (Japan Agency for Marine-Earth Science and Technology) advised, at the request of President Sugino, that he could develop a probe using commercially available glass balls which free-falls to a depth of about 8,000 meters and returns to the surface by jettisoning a ballast weight. This advice constitutes the basis for the Edokko Ichigo submersible. After the basic concept was formulated, the member firms of the Project Committee launched the development of constituent components. The members of the consortium, including the professors and students of universities and private companies, also contributed significantly to the development of control computers and telecommunication components. The Tokyo Higashi Shinkin Bank served as the secretariat for the project.
Milestones
Features
Structure
Edokko Ichigo consists of four glass balls, a frame, a fish bait bar and a ballast weight. The glass balls consist of a communication ball, a transponder ball, a lighting ball and a video recording ball, which are connected vertically in a descending order. Each ball, housed in a protective plastic enclosure, can withstand deep-sea pressures. Among the four glass balls, only the communication ball is connected to the frame via a rope. The other balls are fixed on the 1.5-meter-long metal frame. The fish bait bar and the ballast weight are fixed on the bottom of the frame.
Equipped devices
A GPS receiver, a satellite phone, a transponder, an LED module, a commercially available 3D Handycam (Sony), a controlling computer, a range of sensors, batteries, a weight-release device and a ballast weight.
Missions
Video recording functions
The submersible is equipped with a commercially available full high-vision 3D handycam (Sony HDR-TD20V) that is capable of continuous recording for up to nearly 10 hours using an external battery.
Edokko-1 project committee
Support organizations
Technical Support Organizations include
Sponsors
Equipment Sponsor
Ultra-deepwater dive test at a depth of 7,800 meters in Japan Trench (November 21 – 24, 2013)
The submersible and the members of the Edokko-1 Project left the port of Yokosuka aboard “Kaiyo,” a survey ship owned by JAMSTEC, for the Japan Trench off the coast of Boso Peninsula. A total of three submersibles were released; two were dropped to 7,800 meters and one was dropped to about 4,000 meters. Each of them was raised successfully after 3D full hi-vision recording of deep-sea fish for 5 to 30 hours. Gammaridean and Pseudoliparis belyaevi were filmed at the depth of 7,800 meters, while Macrouridae and Spectrunculus grandis were filmed at the depth of 4,000 meters. This is the first time in history that the images of deep-sea fish at these depths were captured using a 3D video camera. The pictures, taken from diagonally above, show the clear images of fish moving around the submersible.