深海は「地球最後の未開地」だそうです。日本の周りは未開地だらけですね。(The deep sea is said to be the last undeveloped area on earth. There are many undeveloped areas around Japan.)

2020/08/22 ブログ









 現在の所、最新の水中ドローンでも水深300mが潜航限界です。元々、水中ドローンは手軽に水中を楽しむための機器です。研究等に利用する大型のROVとは使用法が異なるのかもしれません。しかし、今後より深い所に行って、映像を撮影する水中ドローンが開発されるかもしれません。ただ一つ課題があるとすれば、水中ドローンを繋ぐケーブルです。当自然環境活用開発合同会社がレンタルしているCCROVやInspector 1はケーブル長が90mを超えています。この2機種に関しては、今でもケーブルを手で巻き取ることが難しい時があります。水深500mを潜航する水中ドローンは、自動ケーブル巻き取り装置が必要でしょう。しかし、各国が水中ドローンの開発に積極的な理由は、大型のROVは経費が掛かり過ぎる点にあります。海はとても広いので、調査や開発を行うためには、やはり経費を抑えることが必要不可欠となります。逆に経費を抑えることが出来れば、海の開発は容易になります。水中ドローンの開発は、海を開発するために必要と言えるでしょう。

Recently, an international team of marine scientists discovered 30 new invertebrate species in the deep sea around the Galapagos Islands, Ecuador, South America. According to the Galapagos National Park, the group of organisms discovered by deep-sea experts is a group of soft corals and sponges, including 10 species of coral, 4 species of octagonal coral, 1 species of spider starfish, 11 species of sponge, and Koshiori shrimp. It contained four known crustaceans. They are the result of researching the deep-sea ecosystem with a maximum depth of 3400 meters using the latest remote-controlled unmanned submersible (ROV). It was revealed that many unknown creatures still live in the deep sea. From the current equipment analysis technology and biological analysis methods, unknown organisms can be used as is as unknown substances and genetic resources for future industrial and technological development. The waters with a depth of 3400 m are not so deep even though it is called the deep sea, so the creatures may be diverse. In deeper waters, the number of species will be considerably reduced, but on the contrary, there may be more rare species.


Around Japan is full of "deep sea."


 The Kuril Trench, the Japan Trench, the Izu/Ogasawara Trench, the Ryukyu Trench and many other trenches are located around the Japanese archipelago. Some deep seas are included within Japan's large exclusive economic zone (EEZ). Although there are countries with deep trenches such as Chile, New Zealand, and the Philippines, Japan is superior in technology for exploring the deep sea. The Japan Agency for Marine-Earth Science and Technology has equipment for investigating deep water over a depth of 3000 m, and there is also deep-sea research equipment called "Edokko 1" even in the private sector. A resourceless country and many people are looking at Japan. If the deep sea is "the last undeveloped land on earth", the development of this undeveloped land may brighten the future of Japan. If you can find something with a high market value from the deep sea, such as the search for industrial materials and pharmaceuticals, the development as a tourism industry, you will be able to benefit from the deep sea, not as a research target.


Improving the performance of underwater drones will facilitate exploration of the deep sea.


 Currently, even the latest underwater drone has a diving limit of 300 m. Originally, an underwater drone is a device for easily enjoying underwater. The usage may be different from the large ROV used for research. However, underwater drones may be developed to go deeper and shoot video in the future. The only issue is the cable that connects the underwater drone. CCROV and Inspector 1 rented by this natural environment utilization development joint venture have a cable length of over 90 m. For these two models, it may still be difficult to wind the cable by hand. An underwater drone that dives to a depth of 500m will need an automatic cable winder. However, the reason why countries are actively developing underwater drones is that large ROVs are too expensive. The sea is so large that it is essential to keep costs down for research and development. On the contrary, if the cost can be kept down, the development of the sea will be easier. Underwater drone development can be said to be necessary to develop the sea.